Zeldris

is an elite warrior of the Demon Clan, serving directly under the Demon King as the Piety of the Ten Commandments. He is the younger brother of the series main protagonist, Meliodas, as well as the youngest son of the Demon King. He is also the Demon King's representative and executioner.

Appearance
Zeldris is a short yet muscular young man. He greatly resembles his brother Meliodas, though with a few slight differences. His hair is spikey black and grows counterclockwise to Meliodas' and they both have the same demon mark, except his is over his left eye instead of his right. His full demon mark is similar to his older brothers when he was the leader of the Ten Commandments.

His attire is a body suit, crimson in color and has a white insignia on several places. The suit has a open collar and exposes his chest. He has silver gauntlets and carries his sword with a strap on his hip.

Personality
Zeldris is very calm and collected, seemingly not easy to anger. Like his brother, Meliodas, Zeldris appears to have good commanding and leadership skills.

Zeldris is highly confident in his abilities. Clashing with his own brother Meliodas in the past, a very powerful opponent and remains unfazed at the prospect of doing so again and even initiating an attack against him. His confidence in his own abilities develops a certain degree of arrogance towards beings weaker than him. Likewise, he doubts Fraudrin's abilities because of him not being able to obliterate a country of humans. Zeldris is even confident that he alone is more than enough to deal with the Seven Deadly Sins, even smiling as he claims so and also believing that he is more powerful than Meliodas and therefore more worthy to be the new Demon King, and unhesistantly taking on his brother again now in full power alongside Estarossa.

However, Zeldris has limits in his patience and, altough he rarely shows it, is not above mocking the ones he had an antagonistic relationship with, he clearly mocks Elizabeth in their short conversation and showing tremendous anger at her for being the reason of his brother's betrayal. Zeldris also was visibly angered by Drole and Gloxinia's betrayal, saying openly that a Giant and Fairy King can never work properly with the Demon Clan. He also gets angry after learning that Meliodas is set to be the new Demon King and showed furious rage when fighting and being easily subdued by his elder brother, who is now back to full power. He also mocks Meliodas on the fact that Elizabeth ran away from him.

Despite being seemingly ruthless and cold-hearted, Zeldris was once much better. Meliodas has stated that Zeldris idolized Meliodas greatly when he was still the leader of the Ten Commandments and was seen with a smile in his face when around him. He also said that Zeldris was almost sincere and honest to a fault. The main reason of Zeldris' cold heartness was because he had fell in love with the Vampiress Gelda and unlike almost all other demons, he only sought to protect her rather than being interested in triumphing over the Goddess Clan. Upon being ordered by his father to kill the Vampire Clan, in the end, overwhelmed by the indescribable pain to the point of bursting to tears, he couldn't bring himself to do it and instead sealed them all away for Gelda's sake, showing how deeply he loved her and valued his romantic relationship with her in the past. The pain of being betrayed by his elder brother who he looked up to and the great suffering he endured from losing his lover made Zeldris the demon he is now, which only served to increase his anger for Meliodas's betrayal tremendously. He is thus unwilling to negotiate with Meliodas and clearly shows his strong grudge towards him, to the point that he openly said that the only thing he has is his rage towards Meliodas as well as his desire for vengeance towards the other Clans. However, he still retains fractions of his good side, as he shows his belief that Meliodas is suffering due to having betrayed his clan after meeting Elizabeth, indicating Zeldris possess some doubts on their estranged relationship. He later seemed to silently contemplate forgiving Meliodas when Meliodas apologised to him. He also showed care for his brother Estarossa, even saving him from an attack that could also kill him, and also showed great loyalty to his father, as evidenced by the fact that he, albeit begrudgingly, obeyed his father's order to crown Meliodas as the new Demon King. Zeldris was also evidently shocked when Estarossa suggested that they kill their own allies to get their commandments more quickly, showing that while ruthless against traitors, he does not approve to simply killing his comrades.

Zeldris apparently has an unknown goal that he can only achieve by becoming the Demon King and thus would do anything to get the title. However, once Meliodas apparently offered to achieve this unknown desire, Zeldris reluctantly agreed to help Meliodas, showing how much he desires to achieve his goal. It cam be assumed that this desire is to revive and reconcile with Gelda, thus regaining the happiness he had lost along with her sealing and later death, although whether becoming Demon King would give him the power to do so remains unknown.

3.000 years ago
Zeldris was mentored by Cusack and Meliodas in combat before he completed his training and stopped learning under his master. He idolized his elder brother when he was the leader of the Ten Commandments and at some time fell in love with the Vampiress Gelda. During the great war, Zeldris was tasked with executing the Vampire Clan who attempted to overthrow the Demon King. However, instead of killing them, he sealed them away for Gelda's sake. Sometime in the past Zeldris clashed with his brother Meliodas. He also said he had met and likely fought the Goddess Elizabeth in the Holy War.

Memories of the Holy War arc
Near the end of the war, he was sent to capture or kill the recently escaped Gowther, during which he easily defeated the Giant King Drole, and offered him and the Fairy King positions in the Ten Commandments. Along with the rest of the Demon Clan, Zeldris was sealed away by the Goddess Clan after losing the Ancient War against the Four Races (Human, Fairy, Giant and Goddess Clans).

Albion arc
After Hendrickson managed to remove the seal, Zeldris and the rest of the Ten Commandments appeared before the terrified former Great Holy Knight and Fraudrin in Dreyfus' body with Zeldris uttered Meliodas' name as if he knew him. After being informed by Fraudrin of the current events in Britannia, Zeldris suggested that they should head for Edinburgh Hill for recuperation of their severely drained magical powers due to the seal they're trapped in, which everyone agreed and left Zhuhur Valley by flight, leaving a terrified Hendrickson.

Arriving at Edinburgh Hill, Zeldris and his fellow Ten Commandments find a castle in ruins and concludes that it was Meliodas who caused the destruction of the castle as if there was a great battle fought there before noticing his brother Estarossa in a laid-back self, relaxing in the castle's ruins much to Zeldris' chagrin. After talking about the destruction of the Albions, one of them presumably defeated by Meliodas, making Galand decide to go and check it out. Zeldris stops him saying his cockiness was what caused them their lose before, but Galand leaves nonetheless, much to Zeldris annoyance. Later on, the Commandments continued to rest and recover their magical power through the souls of humans they devoured and were shocked when they sensed Meliodas regain his full Demon powers at Istar.

Istar arc
Suddenly, Meliodas appeared out of nowhere through Merlin's teleportation and casually greeted the Ten Commandments who were alarmed of his sudden presence, Zeldris attempt to fight but Galand stopped them because he was determined to finish off where he started. Meliodas battled and defeated Galand in less than ten seconds before warning Zeldris that the Seven Deadly Sins will defeat the Ten Commandments with everything they've got. In response, Zeldris and Fraudrin attempted to attack Meliodas from both sides, but he was teleported back to Istar. Afterword, Zeldris suggest the Ten Commandments to split up and move across the land to regain their magic faster while calming Galand down after his loss against Meliodas. However, Zeldris remained behind as Estarossa refused to move as he wanted to relax after being sealed for so long while Zeldris decided to look around.

Great Fight Festival arc
Zeldris is revealed to have toppled the Kingdom of Camelot's royal capitol, single-handedly, seemingly having parted ways with Estarossa.

Later on he, along with the other Commandments, arrive to aid Drole and Gloxinia who are facing off against Meliodas. As he stands face to face with his brother, Meliodas immediately attempts to slash him across the chest. Completely unfazed, Zeldris was able to not only avoid the attack but cut Meliodas' arm off. Meliodas then kicks him in the face and attempts to reattach his arm, but Zeldris, unharmed, steps on it to prevent it from reattaching, and calls Grayroad over to place his Jubaku Ensa on Meliodas, to prevent him from escaping. Zeldris later tells a now severely beaten Meliodas that his death will be the first part of their revenge and if it were not for his betrayal, the Demon Clan would have not been defeated in the war.

Defensive Battle for Liones arc
A month after the death of Meliodas, Zeldris and the Ten Commandments continue with their conquest of Britannia. During the invasion of Liones, Zeldris manages to get several Holy Knights and civilians to fall under the effect of his Piety commandment and become the blind slaves of the Demon King and himself. After Fraudrin praised his commandment, he tells him how weak he is and is annoyed, then both feel the incredible concentration of power of Escanor and go to the castle to know what happens. There they witness the fight between Escanor and Estarossa, Zeldris is surprised that someone is able to battle his brother. When the fight moves out of Liones and Estarossa seems to win the upper hand, Zeldris says he has already decided, but Escanor manages to release an attack strong enough to obliterate Estarossa and send him away. Zeldris tries to help him, but only manages to be absorbed by the attack and sent remotely far away along with Estarossa.

Corand arc
It is revealed that Zeldris survived Escanor's attack. In Camelot, Zeldris senses Merlin scouting Camelot in search of Arthur Pendragon using Orlondi. He swiftly attacks the mage with his magic through Orlondi and manages to curse her but she manages to escape before Zeldris can kill her, impressing him.

While Elizabeth tries to cure Merlin, Zeldris came to see who was trying to cure Merlin and was visibly shocked at seeing her again but quickly recovers. Zeldris immediately starts mockingly greeting her, saying it is been quite a while since they last met and calling her a pitiful woman before getting angry when Elizabeth demands he tell her what he means. Zeldris calls her "Cursed Goddess Elizabeth" and asks her if she still brings Meliodas suffering while revealing he is Meliodas younger brother. When Elizabeth confusingly asks Zeldris on his words, Zeldris realises the rumor of the Curse is true and reveals what he knows to her while annoyingly answering that it is off course her when Elizabeth questions on Meliodas' lover. When Elizabeth smiles, Zeldris is shocked and asks her on it. He gets angry when she tell him of what she dreamed of was true, and angrily screams for her to remember what had happened.

Prelude to the New Holy War arc
Some time later in Camelot, Zeldris tries to remove Excalibur from its place but he did not even budge it, as Zeldris comments on the blade's magic being completely different from that of demons

In that moment, a Gray Demon comes and informs him that over one hundred demons have been killed, but they still do not know who the culprit is. Zeldris is annoyed by this, and decides that he will personally punish the criminal.

Then, Zeldris is contacted by his father who tells him that Meliodas will replace him as the Demon King and he is to accept his elder brother as his new king, much to Zeldris' anger. Reluctantly agreeing when the Demon King sternly told him to not argue and retrieve Meliodas, Zeldris telepathically calls the other Commandments but none of them responds to him except Gloxinia and Drole, who told him that they have abandoned the Commandments and are enemies of the Demon Clan. Disappointed and angered with the Giant and Fairy Kings decision, Zeldris responds by stripping them of their Demonic power and Commandments before cutting off contact without another word after saying that a Giant and Fairy could never properly work with the Demon Clan. Zeldris smirks unleashing his aura, saying he alone is enough to crush the Seven Deadly Sins and he will show his father who is truly worthy of being the next King of the Demons.

In that moment, two demons, Cusack and Chandler, appears, much to Zeldris' pleasent surprise. Noting that his former mentor and Meliodas' former teacher's power is more than enough to fill in the vacancy of the missing Ten Commandments, Zeldris reveals to Chandler that his father has ordered him to rescue Meliodas and crown him as the new Demon King. He blatantly answers Cusack's evident criticism of the order by saying even he can never understand what the Demon King is thinking. When Chandler happily leaves to do so alone, Zeldris says aside from Chandler, there is no other demon more capable of defeating the Seven Deadly Sins. Right there, Estarossa wakes up momentarily from his coma, claiming that they do not leave him aside and asking if Meliodas is really still alive. Zeldris recommends him not force himself until he have healed completely. While they wait for Chandler, Zeldris and Cusack discuss the attitudes of the Pacifier Demon and his inevitable victory if he were to unleash his authentic form leaving aside his obsession with Meliodas.

When Meliodas finally returns accompanied by Chandler and Elizabeth, Zeldris receives him at the castle praising his guts. When Meliodas claims that he intends to become the Demon King, Zeldris affirms that he will be the one to have said position. After Estarossa shared his disagreement with Meliodas, the two jump to attack him. However, Meliodas manages to subdue both with his dark matter, immobilizing them against the ground with great pressure. Zeldris tries to prevent Cusack from intervening and can not believe that he can not move even with the power that his father gave him, recognizing the strength of his brother. After being released, Zeldris refuses to accept that Meliodas becomes the Demon King, knowing that he only wants that to break the curse that lies on him and Elizabeth. Meliodas says he wanted to achieve it by taking the magic that the Demon King had lent to Zeldris, but then says that he already understands that this will not be enough. Zeldris resumes his fierce attack on Meliodas claiming that he will become the Demon King, but he is easily overcome. When Meliodas catches him, he tells him that he knows the reason for his obsession with the throne, going on to tell him something that only Zeldris can hear. Suddenly, Zeldris decided to collaborate with Meliodas reluctantly, leaving Cusack and Estarossa impacted. Zeldris agrees that Meliodas will not reach his father's level with the borrowed power he possesses or training. When Meliodas reveals his plan to absorb the ten Commandments to reach the power of his father, Estarossa asks Zeldris if that is possible, leading Zeldris to reveal that he has the Commandments of Gloxinia, Drole and Gowther, and quickly retires them when Estarossa tries to take them. Zeldris uses the spell that removes Commandments in Estarossa but this does not work, revealing Zeldris that the only way to remove a Commandment from its bearer is that it is his consent or that he is unable to fight in response. Zeldris asks Meliodas how he intends to obtain the Commandments because they can not take them voluntarily as happened with Drole, Gloxinia and Gowther. There Estarossa asks what would happen if they were dead, revealing Zeldris that then the Commandment could be removed without prolemas of the corpse. Zeldris is surprised to discover that Grayroad was defeated by Merlin and that Meliodas has her Commandment. Zeldris affirms that Meliodas recognizes his place when he says that he can not accompany them to retrieve the other Commandments given that nobody would deliver them to a traitor of the Demon Clan. Before leaving in search of the Commandments, Zeldris warns Estarossa not to try to keep the Commandments for himself.

Following the weak trace of Melascula's magic, Zeldris arrives at the Boar Hat where he is confronted by Merlin and the other Sins. Zeldris claims not to know Melrin when she recognizes him, but when Merlin flies back to her original form, Zeldris identifies her as the girl who received the blessings of the Demon King and the Supreme Deity, impressing the other Sins.

Zeldris and Merlin go to heavens in order to have a negotiation for Melascula. Along the way, Zeldris tells the whole story about Merlin's past in Belialuin, which is heard by the Sins through a magical plant that Merlin left behind. When Zeldris ask about her intentions, Merlin also ask about the reason for what he is helping Meliodas to obtain the commandments and become the Demon King. When Zeldris denies given answers and insists that Merlin deliver him to Melascula, Merlin locks her into her Perfect Cube, forcing Zeldris to give her something in exchange for Melascula. Merlin request that he hand over to Elizabeth and Arthur, but Zeldris denies because Meliodas would interfere with the first and his ignorance about the location or state of the second. Zeldris finally agrees to release all the Liones's Holy Knights and civilians who were under the effect of his Piety.

Zeldris insists to Merlin that he fulfills her part, but this is limited to rambling. When Zeldris warns her to cut her if she tries to do something, Melin says she will not do anything. At that time, Ludociel, who was possessing the body of Princess Margaret, attacked Zeldris from the Druid temple where Gilthunder was a prisoner. After Merlin escaped with Melascula, Zeldris emerges having survived and realizaes that the Four Archangels are revived: He then ttacks Ludociel with his Dies Irae.

Zeldris returns with Meliodas and their masters regretting that he did not recover Melascula's commandment and reveals to them that Ludociel and the other Archangels had been revived. When Meliodas reveals that the Four Archangels have allied with Elizabeth the Seven Deadly Sins, Zeldris delights in her escaping from Meliodas.

Some later, Zeldris and Cusack surprises Arthur prowling around the castle. When they ask him his identity, Arthur reveals to be the king of Camelot, allowing Zeldris to deduce that he is looking for Excalibur. Cath manages to distract the demons to give Arthur the possibility of escape.

When Arthur manages to find Excalibur, he is attacked on the back by Zeldris and Cusack, who show Cath completely wounded and defeated. There, Meliodas appears revealing that he have betrayed his friends, causing Arthur to defy them after brandishing Excalibur. While discussing with Meliodas the strange magic of the sword, Arthur manages to cut Cusack and Chandler in half and destroy much of the castle. Zeldris then attacks Arthur but he blocks all his attacks without having to see them, which Zeldris recognizes as Mumyo no Mai. Zeldris wonders how he knows that old technique to which Arthur tells him not to underestimate humans, proceeding to attack him with Deathpecker. Both Meliodas and Zeldris recognize these techniques as those belonging to the ancient masters of the sword and understand that they are dealing with the power of Excalibur. Arthur manages to evade the attacks of Meliodas and Zeldris and deal with them blunt blows with Excalibur. However, these fail to make a dent in the two demons.

Current arc
Just before the Holy War was unleashed, Zeldris gives Meliodas all the commandments he had in his possession, including his own. When he can no longer wait for Estarossa, Meliodas proceeds to absorb the five commandments in his body. Before this, Zeldris reminds Meliodas of the whole reason why he agreed to help him become Demon King and Meliodas says that he will keep his promise after becoming Demon King. Zeldris says he is counting on it and Meliodas then asks Zeldris for forgiveness for the kind of older brother he has been. Zeldris does not answer but looks away, implying he is contemplating forgiving Meliodas.

Zeldris watches next to Cusack the cocoon in which Meliodas was, affirming that the absorption of the Commandments was being carried out correctly and that the body of Meliodas accepted them without problems. Zeldris says that they should look for the other Commandments as soon as possible and deal with them.

When the spell that Gowther had used 3,000 years ago began to fall apart because Meliodas and the Demon King discovered the truth, Zeldris and Cusack, like all those who were under its influence, begin to suffer the effects of the spell that kept their memories altered. Thus, Zeldris recognizes that his supposed brother "Estarossa" is actually the Archangel Mael.

Abilities and Equipment
As a member of the Ten Commandments, younger brother of Meliodas, and son of the Demon King himself, Zeldris is an extremely powerful demon. Like all members of the Demon Clan, he possesses the mysterious jet-black power of darkness which he can use for a variety of purposes, such as forming wings to fly. His aura, combined with the aura of the other Ten Commandments is so terrifying that it made the normally calm Hendrickson sweat in fear by their presence and unnerved Meliodas when he sensed it from several kilometers away.

According to Meliodas; due to having been lent the power of the Demon King, Zeldris' power can equal that of the Demon King and Supreme Deity, and that he has the power to remove the curse on him and Elizabeth. However, once Meliodas returned to become Demon King, he states that even with the power Zeldris borrowed from their father, it still pales in comparison to the true power of the Demon King to which Zeldris agrees to. His aura alone terrified Arthur Pendragon, who states that his power rivals that of his old mentor, Cusack. His aura is also strong enough to completely terrify the countless heroes inside Excalibur.

Zeldris is capable of inflicting a curse on Merlin, an individual with natural resistance to the effects of demonic magic, which would have killed her and was so powerful that even Hendrickson, who spent years studying Druid magic, was powerless to do anything to save her. He has the ability to telepathically communicate with the other Commandments even throughout all of Britannia. Due to being the Demon King's representative, he is able to grant the Commandments to others and remove them from any member of the Ten Commandments if they allow it or if they are unable to fight back, as shown when he was able to strip Drole and Gloxinia of their status as members of the Ten Commandments. He is also shown capable of supressing the powers of others, even ones as powerful as the Giant King Drole, due to being lent the magic power of the Demon King.

Zeldris can enlarge his demon mark similar to his older brother, Meliodas, when he was the leader of the Ten Commandments, and is the only demon alongside Meliodas known to be capable of surviving taking in multiple Commandments into himself.

Zeldris possesses immense levels of skill in combat as he was able to single-handedly easily render Camelot's entire military forces, the second most powerful kingdom in Britannia, completely powerless, without sustaining any injury. Furthermore, he is capable of getting the better of his elder brother, Meliodas, when he had not regained his true full strength and easily brought down Drole, the Giant King, with a single kick. He has shown to be extremely fast and has extraordinary reflexes, cutting Meliodas' arm off in one swing before the latter was able to behead him. He is also extremely durable, as he was unfazed after taking a kick by Meliodas to his head with his demon mark activated and even survived being hit by Escanor's Cruel Sun at close range. Even when hit by a very powerful attack from Ludociel, he only sustained minor bruises.

Abilities

 * Zeldris' innate power. According to Zeldris, the Demon King lent his magic power to him for him to use.


 * A mysterious ability possessed by Zeldris that allows him to generate black flames. It also has the additional effect of nullifying an immortal's regeneration.


 * Zeldris summons a portal over his desired target, and releases a massive lightning bolt to strike them down.

Commandment
Zeldris was bestowed with the Commandment of by the Demon King. Any who turn their back to Zeldris are treated as committing an act of treachery and are cursed into serving the Demon King, and by extension Zeldris himself who is acting as the Demon King's representative.

Weapons

 * Shortsword: Zeldris wields a shortsword with a sharp point on the end. He demonstrates high levels of expertise in swordplay, using it in a manner similar to Iaido, slashing off his brother's arm before he could behead him and resheathing his blade instantaneously. For an unknown reason, he has the Goddess Clan symbol on his sword.

Meliodas
Zeldris once idolized Meliodas when he was the leader of the Ten Commandments and was trained in combat by him. However, after Meliodas betrayed the Ten Commandments and caused the Vampire Clan to attempt to revolt against the Demon King, forcing Zeldris to seal them away as the Demon King ordered Zeldris to execute them but Zeldris couldn't as Gelda was among the Vampires, Zeldris came to greatly resent Meliodas and harbors extreme anger towards his traitorous brother, as he was forced to separate with his lover due to his betrayal. He remained unforgiving of Meliodas' actions despite knowing that Meliodas harbors guilt for that and refused to negotiate with him. He has said that one of the things left in him is his rage towards Meliodas, showing just how much Zeldris came to despise him. Hence, he did not care that Estarossa killed Meliodas, likely being even pleased that his elder brother was no longer an obstacle to his plans and possibly that Gelda's death was avenged, although whether he is aware of Gelda being killed by Meliodas remains unknown but it is safe to assume that as he has seen the hole in Edinburgh that he did, which likely made his resentment towards Meliodas even greater, and even confidently attacked him head-on without hesitation but he was most likely aware that Meliodas would ressurect eventually. However, Zeldris himself apparently views Meliodas is suffering around Elizabeth and does blame her for his brother's betrayal, implying he does feel some doubt for their estrangeness. Nevertheless, any bond they had has vanished despite Zeldris apparently having some doubts on his antagonism towards his older brother and finds his actions and betrayal towards the Demon Clan and the fact that his betrayal forced him to seal away Gelda to be unacceptable and unforgivable. Zeldris also expressed outrage at The Demon King's order to retrieve and crown Meliodas as the New Demon King and was quick to furiously attack him alongside Estarossa and expressed absolute rage when Meliodas easily subdued him, still trying to get up despite the overwhelming power Meliodas exerted to pin him down. However, Meliodas promised to fulfill Zeldris' unknown desire that can only be fulfilled by becoming the Demon King and Zeldris reluctantly accepted that he will be working with Meliodas, altough this alliance does not stop Zeldris from mocking Meliodas when Elizabeth escaped but they still work well in combat together against Arthur. The fact that Zeldris trusts Meliodas will fulfill his desire implies he still has some trust in his elder brother.

Meliodas recently apologizes to Zeldris, asking for forgiveness for being the kind of older brother he's been. Zeldris is silent, but seems to be pondering what Meliodas said which may indicate that they both did have some desire to reconcile and subconsciously care for each other when it happened.

Cusack
Cusack is Zeldris' old mentor and is very attached to him. Zeldris appears to hold him at a high regard, as he believed with Cusack and Chandler, they can easily fill in the vacant spots of the Ten Commandments, but is annoyed by Cusack's displays of affection for him. He also had no qualms calling Cusack's tea and advise horrible. However, he does show some care for him when he told him not to charge at Meliodas after his elder brother easily pinned him down, knowing that his mentor is no match for his elder brother's full power.

Elizabeth
Due to Elizabeth being the reason why Meliodas betrayed the Demon Clan, which forced him to seal away Gelda and also caused his clan to be defeated in the Holy War, Zeldris strongly despises her and harbors a deep grudge towards her that rivals even his grudge towards Meliodas, if not even more. Upon meeting her, Zeldris lightly mocked her, calling her a pitiful woman and taking visible pleasure in taunting the lover of his elder brother, but quickly showing quite large amounts of anger when Elizabeth demanded he tell her what he is talking about and staring angrily at her when she calmly acknowledged she made Meliodas suffer. He even angrily told her, as she cures Merlin who was cursed by Zeldris, to remember everything and know the true depth of her sin 3000 years ago. However, it appears that despite their antagonistic relationship, Zeldris does view her as someone impressive as he didn't dismiss her when she came into the dark space created by his magic, and even openly called her an interesting guest.

Gelda
At some time during the war with the Goddess Clan, Zeldris met and fell in love with the Vampire Gelda. His desire to protect her was what drove him to become the ruthless-cold hearted executioner of the Demon King according to Meliodas, with Meliodas himself saying that Zeldris worked so hard and desperate that even he didin't understand why until he met Elizabeth. When the time came for Zeldris to execute the Vampire Clan, having to kill the one woman he loved caused him great suffering and he ultimately could not bring himself to do it, instead sealing her and the Vampire Clan away.

Galand
Zeldris seems to hold Galand in contempt, viewing the older demon's pride as symbolic of why the Ten Commandments were humiliated and sealed in the war. When Galand urges Melascula to locate Meliodas after he "greets" them Zeldris simply replies that, Galand as he was then, would merely be defeated again and that he should cool his head and think, seemingly summarizing his issues with Galand.

Great Fight Festival arc

 * Meliodas vs. Ten Commandments: Win

Prelude to the New Holy War arc

 * Arthur Pendragon vs. Meliodas, Zeldris, Cusack & Chandler: Win

Trivia

 * According to the official fanbook:
 * Handedness: Right-handed
 * Birthplace: Demon Realm
 * Special ability: Execution
 * Hobbies: Dragon hunting
 * Daily Routine: Goddess slaying
 * Favorite food: Dragon meat
 * Dream/Hope: Perfect victory
 * Charmpoint: Nothing
 * Both Zeldris and Meliodas are voiced by Yūki Kaji (Japanese).
 * Zeldris is the shortest member of the Ten Commandments.

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