Merlin/Plot

Introduction arc
Merlin's wanted poster is displayed on a board in Boar Hat.

Armor Giant arc
Using his ability Invasion, Gowther saw in Meliodas' memory that Merlin was the one that attacked and rendered him unconscious, her reasons unclear. Gowther also mentioned that since that time, he had heard many rumors about her, but that none of them led to her.

Kingdom Infiltration arc
When Merlin and Arthur traveled to Liones, she created an illusionary army to get the Grand Masters' attention, as they felt they would not be granted an audience with the king without a large presence. Merlin, disguised with a cloak, snapped her fingers and the army disappeared, leaving Hendrickson and his envoy astonished and impressed. Hendrickson apologized and stated that the king was sick in bed, but still they insisted on seeing him. As he was escorting them to King Liones, Hendrickson attacked them, stating that it was quite common for envoys to be assassinated, even if it was the king of another country. Hendrickson took Arthur while his two Holy Knights accomplices fought Merlin. Merlin easily won the battle and went to support Arthur, healing him after he got hit by Hendrickson's Hellblaze. Arthur told Merlin to stay back while he fought, which caused Hendrickson to reflect on Arthur's and Merlin's abilities. When Arthur was defeated by Hendrickson, Arthur started to blame himself as he was not strong enough, but Merlin, still disguised, told Arthur that he perform admirably and just surviving a fight against a Great Holy Knight of another kingdom was significant. She said that Arthur's first battle was well done and that he should watch Meliodas's battle, as it would serve him in the future, for he was destined to lead Britannia one day.

Later on, Vivian teleported the Holy Knights and the Deadly Sins to a forest in order to prevent them from rescuing Princess Elizabeth. Fortunately, Merlin sends the group back to Liones and begins toying with Vivian, sending her to different locations, enraging her. Vivian attacks her with a strong wind, and as her cloak is torn apart, her identity is revealed. Everyone was either shocked or happy to see Merlin, however, Meliodas was displeased as he believed Merlin was the one who knocked him out ten years ago, and as such wanted answers from her. Yet, he decided to ask her later as they needed to save Elizabeth and Bartra Liones, which Merlin happily agreed with, as she teleported the group to the Royal Chambers. The group was shocked to be in the location so fast and noticed that the Dawn Roar were there as well. As Meliodas was about to try to destroy the door, Merlin revealed that it would be impossible to break in, as it was protected by "Perfect Cube", a spell from the Demon World, and as such would not be destroyed with either strong or weak attacks. Merlin used "Absolute Cancel" and broke the spell, freeing Elizabeth and Bartra. During Dreyfus interrogation, Merlin revealed that Vivian was obsessed with Gilthunder and was willingly to take him and Margaret hostage.

After the situation, Bartra started to cough blood which alarmed everyone until Merlin came and offered to heal him back in Camelot along with Arthur. As Merlin was about to leave through teleport, Arthur told her to wait as he went to Meliodas and offered him the title and rank of Great Holy Knight in Camelot as he believed that they were fated to meet. Everyone was surprised and shocked at Arthur's offer, but Meliodas accepted Arthur's offer, to Elizabeth dismay, as Meliodas believed that since the kingdom was saved, Elizabeth was freed, and Dawn Roar would take over the Deadly Sins' job, there would be no need of him in Liones anymore. Arthur was ecstatic to hear Meliodas acceptance, but Meliodas told him not yet, as he need to stay in the kingdom to restore it, and he still had the Boar Hat to run. Meliodas then asked Merlin if she would rejoin the Deadly Sins, to which she replied not right away and teleported along with the sick Bartra and the depressed Arthur, much to the team's displeasure. As a result, none of the three knew the next serious situation caused by Hendrickson. Later after Hendrickson's death and defeat, Merlin returned to Liones with King Bartra, who had recently recovered thanks to her new hidden technique from the Demon Realm, but Meliodas criticized her for using the king as her magical guinea pig, which the Boar's Sin of Gluttony brushed off so long as the result were good, much to the king's chagrin.

Merlin then listened to the Holy Knights kneeling down before their king, asking for heavy punishment for their sins for blindly following Hendrickson and his evil plot but Bartra instead told them to devote their power to the restoration of their kingdom and thanking the Seven Deadly Sins for saving the country. When Merlin quickly stopped Ban from trading blows with Gowther over Hawk's death, she asked the Goat's Sin of Lust where his armor had gone, and told him that she would get him a new one after hearing his answer. Merlin witnessed Hawk's revival as the Sins rejoiced of their animal companion's return.

Signs of Holy War
The day in which Ban and Meliodas pretend to have their fight, Merlin along with the rest of Liones attend as spectators. There, she reminds both of them that the laws of the Seven Deadly Sins allow them to settle their differences with a fight, but that the others must interfere if it becomes a fight to the death. In order to avoid any damage to the spectators, Merlin encloses Ban and Meliodas in her Perfect Cube to fight comfortably. When Ban is about to use his Hunter Fest, Merlin teleports away to avoid being affected.

During the following days, Merlin detects the presence of Vivian following Gilthunder in secret. When Meliodas asks her to become a waitress at Boar Hat, Merlin accepts only under the condition that Meliodas captures Vivian. After captured, Vivian is held in Merlin's laboratory, using special chains to nullify her magic. There, Merlin asks Gilthunder to decide Vivian's fate after what she did to him and Margaret, but Gilthunder decides not to punish her. Even so, Merlin uses her Curse Engage to curse Vivian and thus causing extreme pain and finally death if she does any wrong against Gilthunder. When Merlin reprimanded her for helping Hendrickson to release the Demon Clan, Vivian claims that they could have controlled them with weapons like the Goddess Amber. There, Merlin states that Goddess Amber can only enclose low-level demons like the Red Demon or Gray Demon, revealing the existence of much more powerful demons within the clan, which causes Vivian to burst into tears.

That night, Merlin fulfills her promise and works as a waitress at the Boar Hat, receiving praise from all the men when they see her in the uniform of the tavern. However, when Meliodas reveals that he planned a routine of singing and dancing for the waitresses, Merlin resigns immediately.

Post-Kingdom Infiltration arc
As Liones was being rebuilt, Meliodas and Hawk were watching over the injured Elizabeth as she slept in her bed. Merlin teleported out of nowhere, and stated that Elizabeth had unlocked her powers without even thinking about it, which had only healed everyone else because she was thinking about all but herself. Even if Elizabeth had some power left, she still would not be heal herself first, which led to Hawk tearing up, believing that Elizabeth should at least think about her health first. Meliodas and Merlin discussed the location of the Eternal Coffin of Darkness, as it was no longer in Liones. Even with Merlin's "Location" magic, she had been unable to find it. However, it was revealed that a strange bird had appeared and flown to the east. Merlin revealed that she had told Arthur that she would be away for a while, as she would rejoin the Deadly Sins for the time being, which made Meliodas glad as it could save them, but still on adge due to her suspicious smile. Meliodas revealed that he still wanted to know what happened ten years ago while Merlin seemed interested in Hawk, calling him a hero which made the tiny pig happy and befriend Merlin. Meliodas realized that he had forgotten something and went back to Elizabeth room while Hawk yelled at him that he should not do anything weird to Elizabeth while she slept.

When Merlin and Margaret appeared in front of Elizabeth's room, Meliodas steps out of the room with a grin which made some of them worried that he had done something weird, until it was revealed that Elizabeth was up and healed for unknown reason. Hawk was overjoyed to see Elizabeth standing again, but wondered why she was moving again. Merlin seemed to know what Meliodas did as it was revealed that Meliodas held her hand and told her that he could not live without her, which made her wake up. At some point earlier, Merlin had given Diane Minimum Tablets to shrink down to human size while the latter's tattered clothes were being repaired for a while. In preparations for the National Foundation Festival, Merlin gave Diane a new outfit and a gauntlet replacing her previously lost one, back at the Forest of White Dreams. During the festival, Merlin, among the crowd of people and Holy Knights witnessed a marvelous display of fireworks. At some point after the festival, Merlin salvaged whatever remains of her Magical Items within her destroyed castle were left, and set up a temporary small castle until her old one was rebuilt. She gave Hawk Balor's Magical Eye as his new ear trinket and explained the fundamentals behind it, demonstrating the analyzing of the passing Holy Knights' Power Levels.

The Boar's Sin of Gluttony unwittingly lied to Hawk that his Power Level was 3000 as a playful joke that fed the talking pig's ego. Later at the award ceremony, Merlin was present with the rest of her fellow Sins and Hawk (who had somehow grown back to normal size), except Ban and King, who were at the new Fairy King's Forest, and Escanor who was still missing. When the king decided to go on with the award bestowing, Merlin witnessed Meliodas calling for the objection and the appearance of three of the Pleiades of the Azure Sky, Deathpierce, Dogedo, and Waillo when the Dragon's Sin of Wrath demanded they stoop forth to have a voice in the matter. The Boar's Sin of Gluttony witnessed a battle between Meliodas and Dogedo which ended in the former's victory and the latter's defeat and unconsciousness, with the satisfied Six Stars leaving the scene. When Hawk begins to panic about his companions' Power Levels, Merlin tells the talking pig that every member of the Seven Deadly Sins' Power Levels are higher than any Holy Knights' and her Power Level was revealed to be at 4710 much to Hawk's dismay.

Much later, the Deadly Sins encountered Gilthunder, Howzer, and Griamore who thanked Meliodas for defending them and Dreyfus, but felt troubled about themselves. Merlin advised them to go out and find the truth for themselves. Merlin accompanied her fellow Sins to meet with King Bartra, who informed them of the growing omen of the Holy War set in Camelot, south of Britannia. Later, Gowther went to Merlin's new headquarter where she gave him strange pills as medicine, which Hawk found tasty. As Diane came in, begging Merlin to find King, which Merlin teases her about, saying he might have turned invisible. Merlin then told Diane that if she stopped thinking about him, he might pop up and told her that they should get ready to leave for Camelot soon. When everyone left Merlin's home, Meliodas walked in, demanding to know what had happened ten years ago and wanting something that was stolen from him. Merlin revealed that she knew that the Demon Clan had been set free and believed Hendrickson was still alive. Meliodas was not worried about him as what he was most worried about is the ones who were set free, as he believed they were the Ten Commandments, hand-picked by the Demon King himself. Hearing, this, Merlin got a bit too excited as the items in her room flew around and asked to talk about this real issue.

Albion arc
Suddenly, Merlin and Meliodas were struck by Gowther's Blackout technique that knocked out everyone in the capital unconscious except for Diane and were believed to be affected as well. But later on, they're revealed to be alright as they searched around the city to find the cause behind the anomaly. There they find Elizabeth regaining consciousness and then the aftermath of the skirmish between Diane and Gowther appearing to be ended in a draw. After the short scuffle has been settled for now with Gowther returning Guila's old memories as well as Zeal's including their breakup of their relationship, Merlin and her fellow Sins confronts Slader who arrived at the scene. The Boar's Sin of Gluttony was pleased to see the Dawn Roar captain and had a favor for him, only for Meliodas to remind her that Slader only listens to the king. Merlin there uses Absolute Cancel to revert Gowther back to his original form as a doll. There she reveals that Gowther is in fact a doll created by a great wizard and ask Slader to take care of him until Gowther´s magic activates again. Merlin and the others returned to the bar where Slader agree to join with them for a while and Elizabeth wanted to join, but Meliodas shut her down coldly to avoid her getting hurt by the Commandment to the displease of others. However, Merlin got a call from Arthur who was under attack from an Albion and teleported to Camelot to battle the giant.

Merlin used her magic to make Hawk Mama fly over Camelot along everyone over her. Upon arriving, they discover the Albion trying to destroy Camelot, but a special magic barrier that Merlin has put around Camelot to protect it from harms stops it, but only for a short while. While Meliodas, Arthur and his men fought against Albion, Liz's Sword was soon broken which Merlin believed it was time for her to return his Sacred Treasure, Lostvayne, that she have found in a bazaar. There, Meliodas used his Sacred Treasure to slay the golem and saved Camelot.

While the group chatted fondly, Galand of the Ten Commandments appeared and challenged everyone to a fight. Meliodas was shocked to see him and Galand revealed that he knew Meliodas and was surprised he had not aged at all for the last three thousand years, but still attacked him. Merlin takes care of Elizabeth, Hawk and Arthur, protecting them with her Perfect Cube. While the Deadly Sins fought bravely, they still lost to Galand, Merlin tries to support them equipping Diane and attempts to teleport Galand away, but the speed of the demon proved to be superior to her magic's. At which point Merlin tried to trick Galand by lying to him until find a way to prevent Camelot to receive more damage. As it turned out, Galand's Commandment of Truth, which turned anybody to stone should they lie to him, turns Merlin in a statue to horror of Arthur. The Deadly Sins were believed to have been killed by Galand, when in reality, his memories were altered by Gowther's Invasion.

Istar arc
While Camelot mages tried returning Merlin's body back to normal, they were not able to, but luckily, Merlin had stored her consciousness in her Sacred Treasure, and revealed that her body could only be returned to normal by the power of a Goddess. The group was still down about losing to Galand. However, Meliodas soon lifted everyone's spirits up by deciding to train more to get stronger, and to figure out a strategy. Even Arthur and Elizabeth would have to awake their hidden powers as well. Meliodas believed the situation was so bad, they would have to bring in Escanor and later went to check up on Diane's health until King popped up to check up on her. When the three checked on Diane, she was shown to have lost all of her memories, up to the point of meeting Meliodas for the first time. While Meliodas and the others talked about Diane's lost memories, King kept Diane company until she started to lose more memories and ran off. Gowther soon revealed that he had uses Lost World on her to test if her feelings for King were stronger than she said. After King punched Gowther, the others followed Diane, who was heading to Megadozer, until they were stopped by Monspeet's fire ball, which Hawk Mama ate, to the others shock. When they could not sense Diane's power level anymore, Meliodas believed she was fine and that they should focus on their training until they met Diane again. Meliodas decided the first thing to do was to head to Istar, the home of the Druids, and the location of Meliodas' stolen strength. On the way, Merlin reveals to his companions the truth about why he took Meliodas's power ten years ago, because it was too dangerous for him to control him by losing himself in his anger, but to fight with the Ten Commandments, they need that power.

Upon reaching Istar, Merlin explains to Slader that they can only enter the sacred land of the Druids if they will break through. After being greeted by Jenna and Zaneri, Merlin is pleased that these two will offer their help.

When everyone decides to enter the Training Caves to strengthen, Merlin says he can not accompany them since she still lacks a physical body. When observing the fight that unties between Meliodas and King, Merlin reveals the nature of the power Disaster of King, able to manipulate the life and the death.

After finally getting his strength back, Meliodas asks Merlin to teleport him to where the Ten Commandments are. Merlin tells him that he knows exactly where to send him by following Galand's presence, but that it will take at least ten seconds for him to bring him back, so he must face what the Commandments do to him at that time. After Meliodas returned safely and defeated Galand, Merlin is surprised by the cat that appears in Arthur's head. After leaving Istar, Hawk reads the new power level of Meliodas as 3,250 which is less than before. However, Merlin tells him that he forgot a zero at the end, leaving everyone shocked by revealing his power level at 32,500.

Defensive Battle for Liones arc
After Grayroad and Fraudrin of the Ten Commandments were able to successfully infiltrate Liones Castle, Merlin, freed from the petrification, appears to stop the former, claiming that she will turn them into her guinea pigs. After freezing Grayroad's eggs to delay the hatching of more Demons and save Howzer from her Five Lost, she engages in a fight with the queen of the Gray Demon. After defending herself from the demon's attacks and kill one of her faces with Exterminate Ray, Merlin is show not affected by Grayroad's Pacifism commandment. There Merlin reveals both her magic ability, Infinity, that lead everyone to call it unfair, and her true identity as the daughter of Belialuin. Utterly shocked, the Commandments are paralyzed of fear and Merlin starts her offensive, ending the fight in one attack by sucking Grayroad in a small test tube with Endless Whirl. She then expresses joy about being able to experiment with such an unusual Demon.

After Hendrickson and Zaratras managed to purge Fraudrin out of Dreyfus' body, Merlin stays with the other survivors of the Commandment's assault on the capital and watches as at first the no longer controlled Dreyfus and Zaratras and eventually Meliodas, who returned from Purgatory, fight Fraudrin. To ensure the group's safety, she arrays the royal family and the Holy Knights in her Perfect Cube.

After Fraudrin was murdered by Meliodas, Merlin met with Escanor who asked how Meliodas was still alive, prompting Merlin to reveal the curse that the Demon King put on him, reviving him every time he died in exchange for his emotions are consumed more and more. In the end, Merlin states that no matter what atrocities he committed, Fraudrin did not deserve to die the way he did.

Memories of the Holy War arc
The night after the defeat of the Commandments, Merlin took care of rebuilding all the damage in the kingdom and castle. The next day, she explains everything to Escanor while he gives her a bath. However, she also claims that the battle is not over as all who were under the control of Zeldris' Commandment fled to Camelot, which is the current headquarters of the Demon Clan. In order to face the next battle, Merlin states that the seven members of the Seven Deadly Sins must reunite to whom Meliodas is agree, so Merlin arranges things to free Gowther from his imprisonment.

Corand arc
While Merlin waits on the roof of the castle of Lions with the other Sins for a prophecy of Bartra about a "full moon" this turns out to be the arrival of Diane and King. After receiving them and hearing about their journey 3,000 years in the past, Merlin says that it could be the temporary regression technique belonging to the Goddess Clan. When Bartra appears and shows Gowther the magical heart that used to belong to him, this one of immediate leaves fleeing. Upon hearing about the "magic heart" that is imbued in the object, Merlin asks the king to allow him to examine it. There, following the rules of the Seven Deadly Sins of always helping each other in times of need, Merlin along with others in search of Gowther.

When Gowther is reached by Diane and King, they try to help him so that he does not erase his memories. There Merlin arrives and reveals Gowther's past with the princess Nadja Liones and how she died and Gowther tried to revive her with his magic heart, erasing his own memories and feelings when he could not do it. However, Merlin reveals that this "magic heart" is actually a common object and that this never had any "magic of heart" since the true heart of Gowther is within him at those moments. Thus, Gowther awakens his dormant feelings and memories, along with his true magical power. Merlin says that Gowther is the masterpiece of the life of a great wizard, so it is not surprising that he has always had a true heart.

Later, Merlin sends Orlondi to Camelot in search of Arthur. While Merlin watches through him from Liones, Orlondi is discovered by Zeldris, who releases his Hellblaze against him, however, Merlin is the one who receives the attack, being seriously wounded.

Merlin then joins his companions in his banquet, asking forgive for her delay. Upon hearing from Diane that the original Gowther finished the Holy War, Merlin and Meliodas are surprised, wondering if it was he who created the Coffer of Eternal Darkness to what Meliodas tells her was created by a giant craftsman. After clarifying the situation of Camelot and the danger that Zeldris represents, Merlin goes saying that they needed a good plan and their absolute cooperation. In the way to her room, Merlin ending collapsing, but Meliodas goes to help her. Meliodas ask her if Zeldris was the responsible for her condition and that she take that risk all for Arthur, a weakened Merlin says that she can not afford to lose Arthur and claims that the young king is her hope.

The next morning, Merlin condition get worse, being completely unconscious and fever in bed. Upon find her, Escanor ask Hendrickson to help her, but his druid powers are unable to do something, as Merlin was under a curse put on her by Zeldris. There, Escanor ask Elizabeth to use her healing powers on her, as Hendrickson affirms that the princess's magic is stronger than of any Druid. After a confrontation with Zeldris, Elizabeth manages to release Merlin from the curse, as she gives her thanks to Elizabeth and Escanor.

After returning to their old armors, Merlin pass to tell her companions about the dimensional distortion that prevents to enter in Camelot by any mean, physical or magical, and that even Absolute Cancel is unable to undo it. Having locating the origin of the distortion in the city of Corand, Merlin states that their next mission is to go there to eliminate the distortion.

Later, Merlin drinks with Escanor hoping to Arthur to be fine. Elizabeth starts acting strange suddenly, saying things related to her past lives. Seeking to confirm what happens, Merlin asks Elizabeth if she recognizes her, being shocked when she tells her that it has been a while since she saw her and asks if she is still living on her own in Belialuin, as well as the Goddess Clan symbols appear in her eyes. When Elizabeth falls unconscious, everyone gathers in her room worried. Merlin claims that her condition may be due to the magic that Zeldris used in her when she released her from his curse. Meliodas reveals that Elizabeth is recovering the memories of her past lives, to which Diane happily says that she will remember everything that she lived, causing Merlin to scold her with taking care of her words. When Meliodas reveals the curse that is on him and Elizabeth, and that Elizabeth will die in three days after recovering her memories, Merlin is the only one of the Sins not to be impacted, being already aware of that fact.

During the trip to Corand, the group stops in Ordan to free it from demons that had oppressed them. Merlin asks Meliodas if it is right to distract from their objective, to which Meliodas tells her that it is their duty as knights to help those who need it.

When they finally reach Corand, they are surprised at the entrance by Zeldris. Merlin tries to warn Meliodas that his presence can not be anything other than a trap, but Meliodas still tries to attack him, turning out to be nothing more than an illusion concocted by Melascula to capture Meliodas in her Cocoon of Darkness.

Upon entering Corand to find Meliodas, the many skeletons that populated the city after the massacre that destroyed it begins to come to life. Merlin identifies it as Melascula's technique that revives the dead through his anger and resentment. Being initially very weak, the Sins have no problems in facing them; Merlin gets rid of several of them with her fire magic. However, Melascula manages to take advantage of the negative energy of Meliodas to give power to his skeleton warriors. Merlin is surprised to see how the strength, speed and resistance to the magic of these is greatly increased. When Gowther is unable to control the skeletons with his Jack, Merlin saves him by destroying them with her Exterminate Ray. Merlin deduces that the skeletons are not moved by nerves that Gowther can control, but by their own resentment and by the enormous dark energy that comes from the center of the city, inferring that this is where Meliodas should be.

Upon Melascula tries to concentrate all the energy in the last skeleton remaining, Merlin anticipates that is impossible for it to sustain the immense power of Meliodas, resulting in its destruction. However, Merlin adverts everyone that the remaining spirits of the dead are trying to take control of them. When Diane ends being possessed by all the spirits and turned against them, Merlin declares that they have no other option that attack her with intention to kill, but King intervenes to prevent it.

Finally, Diane is purified by an awakened Elizabeth, who eliminates all the spirits with her Lest's There be Light. Having recovered all her memories, Elizabeth talks with Merlin about their past together when she was 12 years old, claiming that she become a beautiful woman, which makes Merlin somewhat taciturn. When Elizabeth asks if she no longer calls her "Big Sis Sis" as she used to do, Merlin is very embarrassed. When Escanor asks to know more about it, Merlin recriminates him not to get involved in that.

There, Melascula appears suddenly and assumes the form of a gigantic serpent. When this one is sent to attack Ban after this insulted it, Merlin is protected within her Perfect Cube, taking Elizabeth and Gowther with her.

Suddenly, a giant explosion of dark power destroy the center of Corand. Merlin affirms that it must be Meliodas, who was given freedom to all his demonic power. When Escanor goes with the intention of fight him, Merlin adverts him that in his current state, Meliodas is too much for even him to handle, but Escanor tells her to not worry. Knowing that Meliodas was deprived of all his emotions and feelings to recover his original power and sets free, Merlin traps him and Escanor inside a Perfect Cube, calling Meliodas a fool.

When Melascula is overpowered by Diane and King, Merlin states that the battle was decided at the moment that she underestimates them and chose to fight in that form instead of using her true magic power, affirming that she was too confident. When Melascula is finally immobilized by Elaine and Gowther, the fairy claims to Merlin to kill Melascula, even if that means her own death too. However, Elizabeth uses her Tranquilize to deprive Melascula of all the demonic miasma that gives her demonic powers, returning her to her original form as a harmless little snake. There, Merlin captures Melascula in a test tube as other of her guinea pigs. When Elizabeth calls Merlin little sister, Merlin is embarrassed again.

While the fight between Escanor and Meliodas continues with the demon's advantage, Elizabeth asks Merlin to undo her Perfect Cube so that she stops them, but Merlin refuses because since he can not control his dark power, Meliodas will kill them all if come to be liberated. When Hawk asks what else they can do, Merlin simply states that it's almost midday. Escanor then receives a huge increase of power from his Sunshine, but this still is not enough to stop Meliodas who incapacitates him with a single blow. Merlin affirms that this is the Meliodas recognized by the legends of the Demon Clan and leader of the Ten Commandments. Although Escanor seems to have been defeated, Merlin says that everything comes down to the minute that Escanor assumes his most powerful form during midday, describing him as the supreme incarnation of power, "The One". With that power, Escanor finally manages to defeat Meliodas.

Having finished the battle, Merlin charges Meliodas with his telekinesis while revealing that with the defeat of Melascula, the dimensional distortion on Camelot has been dissipated, but that Meliodas can not go in such a bad condition. Elizabeth asks him to let him cure him, but Merlin reminds him that if he did Meliodas would attack them and nobody could stop him. When Escanor affirms that he will stop him as many times as necessary, Merlin gives him a simple blow, and he falls unconscious.

In the Boar Hat, Merlin explains that Escanor exhausted all his power in his battle with Meliodas, so he is probably in a worse condition than his. By the other hand, Meliodas have lost all his emotions and returned to be the old Meliodas from the Demon Clan. At that moment, Meliodas awakes, but Merlin knocks him again with her Shock Stinger. Merlin tries to lock him in her Perfect Cube, but Elizabeth tries to convince her not to do it. Merlin insists, so Elizabeth asks to be locked with him, to which Merlin agrees only under the condition that she stays to monitor both. Given her appointment, Merlin affirms that Diane, King and Gowther are the ones who will have to fight in case something happens, while in the two remaining days that Elizabeth has left, they think of a way to heal Escanor and recover Meliodas in order to free Camelot.

Prelude to the New Holy War arc
While watching over Meliodas and Elizabeth, Merlin feels the presence of a great dark power that was blinding the entire region. At that moment, an old man appears crying to see Meliodas and when to kill Elizabeth. When this individual manages to undo the Perfect Cube just by touching it with his cane, Merlin realizes that this use Absolute Cancel, affirming that he is not an ordinary enemy. After ordering Elizabeth to retreat, Merlin uses Magic Seal in an attempt to seal the old man's magic, but he responds with Full Counter, revealing being the one who taught Meliodas how to use that power. As a result of receiving his own Magic Seal, Merlin's magic ends up being deactivated, causing it to assume the form of a small child. Seeing her in that form, the elder identifies her as Belialuin's survivor.

When Chandler engages in a battle against the other Sins and Elizabeth, Merlin tries to awaken Escanor to help them. However, because of the artificial night that Chandler had created, Escanor returns to his weak form.

When the Boar Hat is taken out of the battle by Drole and Gloxinia, Merlin who was in search of her Incantation Orb to use Absolute Cancel, hits her head in the middle of the shock and ends up unconscious. After awakening with all his companions around, they explain what happened. Merlin claims that Chandler was a much worse monster than he had imagined. After regretting Gowther's pseudo-death state for opposing the Absolute Order and the microscopic size of Diane, the latter is surprised that her true appearance is that of a girl so tender. Merlin affirms that she must return to his old form as soon as possible, although Escanor prefers that she stay like this a little more. When everyone begins to feel sick, Merlin realizes that it is due to the demonic miasma that Meliodas is expelling, so Elizabeth takes him outside. Merlin asks Escanor if he is well, and he says he is still in a position to fight. After asking for Ban, King tells her that he is with Elaine.

After finding her Incantation Orb and return to her adult form, Merlin helps to clean the room. At that moment, Merlin exclaims in alarm that Chandler is approaching. Upon leaving and discover that Meliodas regained consciousness, Merlin says that it could not happen at a worse time. When he takes Elizabeth and intends to leave with Chandler, Merlin demands to know what he intends to do with her, to which Meliodas reveals that he will become the Demon King to break her curse and at the same time declares the dissolution of the Seven Deadly Sins. When Hawk tries to reason with him and Meliodas speaks to him as if he were the Demon King, Merlin is surprised.

While everyone laments having lost Meliodas, Merlin reminds them that he no longer thinks clearly because the Demon King stole his emotions. When Hawk mentions what Meliodas told him earlier, Merlin asks him to expel him, uncovering to her surprise that Hawk is a living portal between this world and the Purgatory, further revealing that the Demon King has been spying on them through Hawk's eyes. Although everyone is shocked by that, Diane suggests that they could go to Purgatory through Hawk to recover Meliodas's stolen emotions. However, Merlin affirms that it is impossible since they must face the Demon King to do it, and that is also impossible for them to survive in the Purgatory, telling everyone how in the past her father spent a single minute in that place and returned as an invalid elder. There, Ban declares that he is the one who will do it since his immortality would allow him to survive. Merlin reminds him that although his body is immortal, he still has a human soul and that the result is more likely to die in the attempt to recover his emotions. When Ban insists ongoing anyway, Merlin calls him crazy but still recites the spell that sends Ban to the Purgatory through Hawk, reminding him that once there, they can not help him.

While everyone regroups, Merlin examines Grayroad's test tube, discovering that Meliodas took the Commandment of this one without her noticing. Suddenly, Merlin feels powerful presences approaching. While everyone is alarmed because they are not in a position to fight, Merlin claims that she will negotiate with the enemy already having an idea of her identity and that their goal is Melascula's Commandment that she possesses.

Once outside, Merlin discovers that the intruder is Zeldris, stating that it will be much easier than if it were Estarossa. Zeldris says that he has never seen her before, there Merlin resumes his original childhood form asking if he remembers her that way. Zeldris immediately recognizes her as the girl who received the blessings of the Demon King and the Supreme Deity. Upon hearing this, the other Sins are surprised. When the others try to confront Zeldris, Merlin tells them not to interfere and goes to talk to Zeldris in heaven. Before leaving, Merlin releases one of her hairs to create a talkative plant on Hawk for her companions to hear their conversation.

After Zeldris narrates Merlin's past, he asks for her intentions, leading Merlin to ask him why he is helping his brother gather the Commandments and use them to become the Demon King. Zeldris answers only saying that if she gives Melascula, he will forgive her companions. Merlin initially seems to give in, but soon she encloses Melascula in her Perfect Cube, telling Zeldris not to give it to her if he does not give her something in return. Zeldris agrees and Merlin asks him to return them to Elizabeth, but Zeldris says that Meliodas will not allow it. Merlin asks instead to give Arthur, but Zeldris can not give it to her either because he does not know his current situation or if he is still alive. In the end Merlin asks him to release all the knights and civilians of Lioness and Camelot who are under his Piety and to allow them to leave. When Zeldris meets her demands, he demands to disperse the Perfect Cube. Merlin begins to ramble saying that her shoulders hurt and Zeldris warns him that if she tries something he will kill her. Merlin claims that she will not do anything, and at that moment Zeldris is attacked by Ludociel, who was in a Druid Altar near there.

Merlin quickly returns to Boar Hat, revealing to everyone that distracting Zeldris for the Four Archangels to attack him was his plan from the start. Merlin rushes to teleport everyone away saying that that is their opportunity to act.

Finally, in Camelot, Merlin tells her companions that they must reunite all the prisoners that Zeldris let go and return them to Liones. While everyone put the afraid people together for Merlin to teleport them, Elizabeth arrives having scape. Upon everyone reunites, Merlin teleport the Boar Hat again and everyone decides to stop Meliodas to become the Demon King.

Right when Elizabeth and the Sins are back to Liones, they are greeted by Bartra, who thanks them for saving the hostages. When this one ask about the others, Merlin tell him that Gowther is recovering of his wounds and that Meliodas and Ban are absent for their own reasons. When the Four Archangels also arrive and offer to form an alliance with Liones and the Seven Deadly Sins, Merlin declares that they will follow Elizabeth's decision, affirming that she is now their leader. Being unable to save Meliodas on her own, Elizabeth officially creates the alliance with the Four Archangels.

The next day, Merlin was helping Gowther to recover by fixing his body. While examining his body parts, Merlin praises her former teacher, admitting that even when she was thinking of make some upgrades on him, Gowther is so well built that it is no more room for improvements. There, Gowther's head ask Merlin for a favor. Merlin states that she can't make any improvement on him, leaving Gowther to recite a phrase that his creator used to say to express his admiration for Merlin's talent. Merlin accede to listen his petition but with no guarantees. Upon hearing Gowther, Merlin reacts surprised by his request, asking if what Gowther had not been able to say previously about its creator ending the Holy War was related.

Later, Merlin meets with Elizabeth and the other Sins to tell them that she decided to go to Camelot on her own to rescue Arthur. King and Diane tell her that they should wait to be able to go along with Stigma's entire army, but Merlin says that upon noticing their march towards them, the demons would only reinforce their defenses, so it is best to look for Arthur at that moment. Escanor is opposed to her plans stating that it is not worth that she is put in danger by a simple child like Arthur, causing Merlin to give him a furious look. When Hawk asks Merlin why she's going so far to save Arthur when he's not even woken up to his magical power, Merlin reveals that Arthur is a hoping child chosen by the holy sword Excalibur to lead Britannia someday. Although surprised by it, Hawk says that even having the holy sword Arthur is unable to defeat Meliodas and the other demons on his own. Merlin does not answer, be aware that his words are true.

In that, Merlin receives a telepathic message from Cath, telling her that Arthur is about to be killed. Merlin immediately teleports to Camelot, where Arthur was about to be defeated by Cusack. After surprisingly appearing before the demon, Merlin uses Icicle Castle to immobilize Cusack while taking Arthur in her arms. Merlin thanks Arthur for staying alive and also Cath for alerting her to the situation. Meliodas demands Merlin to return the Commandment of Faith, but Merlin tells him that just as he is trying to save his beloved, she and her friends are risking their lives to save him. Just as Cusack manages to break free, Merlin rushes to teleport back to Liones along with Arthur and Cath.

Diane reproaches Merlin for taking that risk by going to Camelot, Merlin says that what matters is that she and Arthur could return safe and sound. Merlin asks Elizabeth to take care of Arthur's injuries, however, Arthur falls under the effects of Cusack's Resonant. After taking Excalibur, Arthur is forced to stick it in his heart, to the horror of Merlin and the other Sins. Merlin is desperate at the demise of Arthur, begging Elizabeth to cure him but this is impossible if Excalibur is not removed. She tries to make him release the sword, but it is impossible.

New Holy War arc
After not being able to save Arthur, Merlin is devastated before its body still crossed by Excalibur. Merlin says that Arthur was a brilliant young man with a magic still unknown inside him, and she reproaches herself for not being able to take out his latent potential afloat, wondering if Arthur was saved from having achieved it. Not knowing if the soul of Arthur left or if it was absorbed by the Excalibur that is already looking for its next owner. Merlin says that after living such a long life, she no longer knows what to feel or think at such a moment, and that all he can see around her is darkness Elizabeth kisses her on the forehead to comfort her, apologizing for not having anything to say to make her feel better. Merlin remembers that little "spell" that Elizabeth used to comfort her as a child.

Recovering, Merlin leaves to the castle next to Elizabeth and Escanor to the meeting of the alliance to decide the strategy for the Holy War. Merlin claims that at all costs prevent Meliodas from becoming the Demon King and free Elizabeth from her curse, but above all will no longer allow losing another person prized for her.

Merlin directs the meeting attended by the Four Archangels and the Holy Knights, deciding what will be the formation for the battle. When Escanor enters into a small argument with Sariel and Tarmiel, Merlin demands silence from them. There, she explains that the forces will be divided into three groups: the "Defensive Force" that will protect Liones from the demons, the "Search-and-Destroy Force" that will advance towards Camelot and face the Demon Clan army directly and the "Assault Force" that infiltrated Camelot to execute a direct attack. Merlin states that the Assault Squad will be conformed by herself, Ludociel and Escanor, in order to avoid being affected by Zeldris' Piety. Once the formation is decided, everyone goes to prepare.

Merlin is in charge of creating special costumes for her and the Deadly Sins to allow them a better performance in combat and ability to regenerate if they break. Merlin has a little conversation with Elizabeth, saying that even when she said before that the awakening of Elizabeth and Arthur's power were vital for that battle, she was not completely honest, since that means that Elizabeth's curse take effect. Then, Merlin says that they must reliant on Elizabeth's power and that she must survive.

When the Assault Force arrive at Camelot, they discover the castle covered by an enormous sphere of darkness, a product of Meliodas' fusion with the Commandments. Merlin asks Ludociel for an idea to enter. Ludociel invokes his Sanctuary, creating an Ark barrier around him, Merlin, Escanor, Hendrickson and Gilthunder, being able to enter into the space of darkness thanks to Merlin's Commandment that wants to enter and join the others. Ludociel declares that once inside they can not leave until they kill the creator of the dark field, Meliodas. However, Merlin declares that there is another way: returning Meliodas to normal.

Upon entering they find the cocoon of where Meliodas is in. The five are received by Zeldris, Cusack and Chandler. Merlin personally confronts Cusack. When the battle begins, Merlin watches as Escanor attacks Meliodas' cocoon, and while the demons are distracted, assaults them with Double Impact. When they emerge unscathed and attack her, she notes that Chandler and Cusack's power far exceeds that of the Ten Commandments. Escanor moves to protect her but is thrown back by the two demons' combined attack, forcing Merlin to repel them with the second stage of her spell, saying that the important thing is to find the way to take Meliodas back, not the numbers.

After Ludociel attacks Chandler and Cusack, and confronts Zeldris, Merlin declares that although the numbers do not matter in that situation, the power of Ludociel was essential to get there.

When Zeldris releases his original magical power, Ominous Nebula, all present are attracted to him by a great force, then being repelled and wounded by a strange force. However, Merlin manages to stay safe by teleporting over and over, taking care of keeping Hendrickson and Gilthunder out of Zeldris' range the same way, a feat made possible by her infinite magical power.

Merlin is annoyed when Ludociel and Escanor argue in the middle of the battle.

Ludociel asks Merlin for the identity of Zeldris' power, leading Merlin to explain how the Ominous Nebula has three characteristics: the ability to draw things towards Zeldris as its center with an incredible power of attraction, including only living beings and that no physical attack manages to reach it, being them hit by an unknown attack instead. Merlin points out that none of the magical attacks that she and Ludociel used previously affected Zeldris, which must be due to the powers of the Demon King. Merlin declares that Zeldris has an attack from which it is impossible to defend himself and on top of that resistance to both physical and magical attacks, which will make the battle harder than they could have imagined.

After Escanor refuses to obey Ludociel and this ended up being attracted by Zeldris, Merlin asks him to help him, to which Escanor obeys catching Ludociel and agreeing to help him fight.

Merlin is surprised when the combination of Escanor and Ludociel fails to overcome Zeldris' ability. There, Merlin notices how the power and speed of the vacuum created by Zeldris increases, attracting her with such speed that it prevents her from teleporting in time to evade the blow of Zeldris who intends to take away the Commandment. However, Escanor shields Merlin with his body taking almost all the attack. When Merlin loses consciousness by the blow, Escanor releases his Crazy Prominence in his anger.

Seeing how Zeldris manages to avoid the attack, as well as destroy a huge debris that falls on him, Merlin finishes deciphering the true nature of the Ominous Nebula, calling it so simple an yet unparalleled in its brutality. Zeldris is not depend of his sight, hearing or sense of presence, since his power is a technique of extreme concentration were Zeldris rotates his darkness at immense speeds, creating a vortex that surrounds and attracts all living beings around him. This power makes the air flow and creates a vacuum and everything that comes in contact with it is sliced at a god-like speed by pure reflexes. Merlin end naming it a Full React.

As Escanor decides to fight Zeldris, he ask Merlin to hold on for a minute. Merlin says the she is done with mistakes and uses Cho-renzoku Teleport to acquire te enough speed to teleport herself and Hendrickson out of Zeldris' power. When Escanor manages to break the Ominous Nebula, Hendrickson and Merlin witness how he manages to hurt Zeldris and leave him at the mercy of Ludociel after being returned to his night form when Chandler creates an artifical night.

When Ludociel manages to hurt Zeldris with his Gold Shining, he takes the heat in a fight with Cusack. There, Chandler decides to take charge himself of Merlin and the others. Escanor asks Merlin if Chandler and Cusack are as strong as they say, leading Merlin to tell that both with the older demons alive, owners of a terrible power and the teachers of Meliodas and Zeldris who were always with them. However, both rarely participated in the old Holy War, leaving much of themselves in mystery.

As Chandler and Merlin decide to start their battle, Merlin fires her Exterminate Ray, to which Chandler responds with the same spell. However, Chandler's Exterminate Ray is much larger and more powerful than Merlin's. As the two attacks collide, Merlin tells Escanor to look for the opportunity to take Rhitta, although he sees none. When Chandler's  Exterminate Ray begins to take the upper hand, Merlin uses Enchant: Infinity so that her attack grows with infinite magical power, surpassing Chandler and achieving to hit him.

When pushed back with several wounds, Ludociel asks Merlin why nothing he does has any effect on the two demons, wondering if it is because of their magical powers. Merlin reveals that at some point in the past, Chandler and Cusack sealed their original magical powers for some reason, but even so they continued to be considered the most powerful demons after the Demon King just for being strong, fast and hard as anyone else.

Escanor asks if they have no weaknesses, Merlin agreeing that they do not. However, Merlin says that it is only necessary to create some. Chandler and Cusack initially does not believe Merlin's words about creating weaknesses in them, claiming that none of her attacks have the slightest effect. However, Chandler is suddenly assaulted by a lightning strike, at the same time that Cusack is hit by a wind concentration. both are surprised at the damage that those attacks caused them. Merlin goes on to reveal that it is the Double Impact she used previously, which is actually an attack combines the magical attributes of the four elements and multiplies it, which allowed Merlin to discover which elements were most vulnerable, being for Chandler the lightning and for Cusack the wind. Also, the second weave of the Double Impact is a spell that decreases the resistance of the opponent and thanks to her Infinity, the resistance of both will continue to decrease with each attack.

Chandler tries to use Absolute Cancel to undo Merlin's magic, but before he can do so he is assaulted by another lightning attack, injuring himself more than with the previous one. While trying to perceive from where the attacks are coming from, Cusack receives another attack. Merlin reveals that her Infinity causes endless and untraceable magical powers of lightning and wind to continue dancing and reacting to every movement or magical invocation they make, assaulting them until they die. Ludociel asks what kind of bizarre magic it is, with Merlin claiming that she does not understand it well either; she took a dual element attack magic, attributing it "invisibility", "undetectability", "automatic tracking" and on top of that, she casted Infinity. Escanor asks her when she came up with all this, and she reveals that she thought about it while using teleportation to escape from Zeldris' Ominous Nebula.

As Chandler and Cusack continue to be stricken by attacks, Cusack refuses to accept that the most powerful demons are being humiliated by a mere human. Then he manages to use Resonant, the signature move that gave him the "Napping Reaper" moniker, on Merlin. Getting inside Merlin's subconsciousness, he sees her true appearance. Cusack mockingly threatens her saying that she will suffer the same fate as Arthur, but not before she nullifies her barricade of attacks. Cusack claims that she will lament in hell for opposing the most powerful demons, when suddenly receives a single punch in the face. Merlin, free of any control, tells him that it was foolish of him to think that she could be taken over, reminding the demon that she got the blessing of the Supreme Deity, on top of the strengthening of her soul and spirit as well. Merlin menacingly claims that Cusack will feel all of Arthur's resentment.

Cusack's soul begins to be slowly tortured by Merlin's consciousness, who mutilates him with snake-like creatures. Merlin praises his resistance to so much pain that it would have destroyed the mind of any other demon, saying that it would be problematic if it were otherwise. Merlin declares that the only way she can fill her heart after losing Arthur is inflicting torment and agony on Cusack, and mutilating his soul until the point where he can no longer return to normal.

When the spell that Gowther had used 3,000 years ago began to fall apart due to Meliodas and the Demon King discovered the truth, Merlin, like all those who were under its influence, begin to suffer the effects of the spell that kept their memories altered. Thus, Merlin realizes that "Estarossa" was actually the Archangel Mael. While Merlin suffers the stress of the spell breaking, Cusack takes the opportunity to escape from her mind.

When Escanor worries about Merlin, she tells him to take the opportunity to take Rhitta. Thanks to this, Escanor resumes his daily form, which relieves Merlin. However, it is alarmed that Cusack, Chandler and Zeldris managed to recover completely.

While Hendrickson and Gilthunder believe that the state of Ludociel is due to the demons, Merlin explains that it is actually the spell of her former master, quickly deduced how he use black magic to alter all the memories about Mael and turn it into "Estarossa", even for the Demon King. Knowing that the impact of the truth in their souls causes a great conmosion, the bigger the closer a person was to Mael, Merlin wonders why Zeldris does not suffer any effect. Zeldris explains that it is because he never looked up at Estarossa as a brother, in fact feeling relieved to discover that he really was not.

When Chandler and Cusack decide to join in their original form, talking about a demon called the "Original Demon" who was punished by the Demon King when trying to dethrone him and divided into two teachers for his children, Merlin is surprised and terrified to feel the magic power that both begin to form. When his fusion is complete, Merlin observes incredulously how the field of darkness created by Meliodas and the Commandments dissipates. There, the Original Demon appears, and Merlin declares that they have lost every chance of victory.

The Original Demons stars a fierce fight against Escanor. When this one receives a big slash in his chest after their clash, the Original Demon points that is a pity that Escanor is no longer on his top. Escanor then uses his Cruel Sun, engulfing the Original Demon. Merlin claims the the only thing they can do is survive until the arrive of the reinforcements, Escanor insists that the two of them are enough to deal with it, but the Original Demon emerges having blocking the attack with his shield, claming that their deaths are already decided. Merlin there attacks him with Exterminate Ray, but the Original Demon easily counter it with his energy breath and then gives Escanor a serious damage with a kick of his back legs. However, before he can finish Escanor, a enormous flying object comes to the scene, astonishing Merlin when it is revealed to be Chastiefol, that deals a huge hit on the Original Demon.

Merlin recognizes that King must be controlling Chastiefol from far distance, indicating that his true power as Fairy King must awake and have and incredible evolution. As Chastiefol assumes its Fourth Form, Merlin teleports herself and Escanor away avoiding the terrible explosion that it release on the Original Demon, leaving Merlin astonished with its destructive power.

As Zeldris is able to use God to cancel Chastiefol attack on the Original Demon, this one reassumes his fight with Escanor and Merlin while Zeldris deals with Chastiefol.

Suddenly, Merlin notices Melascula's test tube glowing, realizing that her Commandment must be reacting to something. As the test tube shatter, Melascula's Commandment leaves her body and joins the other four that appear to be absorbed by Meliodas' cocoon.

While everyone resigns themselves to the Commandments being absorbed, Merlin exclaims that it is far too soon to surrender. There, she begins to make incantations and a magical seal in the shape of a clock appears before her. Zeldris and the Original Demon recognize with disbelief that she intends to use Chrono Coffin, a forbidden art to suspend the cocoon in time. The two attack her in order to stop her, but are stopped by King and Escanor, Merlin asks them to resist enough for her to complete the spell. As Escanor is defeated, the Original Demon pretends to end with Merlin. However, before he could kill Merlin, the Original Demon is restrained by Ludociel who uses Ark to hold on his weapons.

As Ludociel fights the Original Demon, Merlin continues with her spell, lasting ten minutes for it completation, and Merlin ask for Meliodas do not awake until then. As Merlin is knocked down by Ludociel being pushed back, Merlin warns him to stop attacking, having sensed that the magical power of the Original Demon allows him to increase his power as his life is shaved. As she reassumes her incantations, Merlin fears that if his power keeps powering up at such pace, it will be impossible for them to hold out.

After the inrush of Mael, who uses his newly borrowed Sunshine to stop the Original Demon and undo his Darkness spell, Zeldris takes the opportunity to attack Merlin with his dark matter, dividing it into several dark creatures to evade Ludociel's Ark barrier. However, Elizabeth and the Sins manage to protect her, leaving Merlin five minutes to complete the Chrono Coffin.

Mael is able to fight Zeldris the next two minutes, but this one manages to overcome him and release a barrage over Merlin and the others. However, King uses True Pollen Garden to protect everyone, despite Zeldris keeping attacking under desperation of Merlin only lasting one more minute. After Mael defeats Zeldris, Merlin complets the Chrono Coffin and leaves the cocoon suspended in time. While everyone celebreates the end of the Holy War, Merlin is debilitated for the incantation of the Chrono Coffin, saying that will need a lot of booze from Meliodas to recover. However, when Hawk discover that the cocoon was already empty, Merlin along everyone is abrumated by the incredible darkness coming from a Meliodas turned Demon King.

However, Meliodas is revealed to have been turned into his father's vessel, revealing that it was the Demon King's plan from the beggining in creating the Commandments and make Meliodas absorbs them to take his young and stronger body for himself. As the Demon King pretends to kill Elizabeth, Gowther takes her out of his attack for Merlin to use Perfect Cube to protect the three along Hendrickson and Escanor, and also creates one for Hawk. Merlin warns Diane and King that magical attacks doesn't work on the Demon King, but any of them is able to make a threat for the Demon King, who easily incapacitates everyone including Merlin.

When Ban saves Hawk from being killed, Merlin shows happy of know that he was able to return from the Purgatory.

As the Demon King releases a toxic and caustic storm over the area, Merlin and the Sins are protected by King's True Pollen Garden.