Weird Fangs

The are an order within the Holy Knights assigned to Baste Dungeon. Five years before the beginning of the series they fought and captured the Deadly Sin, Ban. The group consists of four members, each with distinct abilities.

After their humiliating defeat and the destruction of Baste Dungeon at the hands of the three Sins, the status of the Weird Fangs are currently unknown.

5 years ago
Five years before the beginning of the series, the Weird Fangs confronted Ban of the Seven Deadly Sins. The resulting battle ended in Ban's intended capture and imprisonment in Baste Dungeon, where they remained as the dungeon's four guardians.

Baste Dungeon Arc
As Meliodas and Co. entered Dalmary Village, they were spotted by Friesia's spy bug and the Weird Fangs decided to launch a preemptive attack on the two Sins. Friesia was the first to go and set loose her swarm of corrosive-spitting insects upon the town, with no regard of the civilians caught in her attack. However, Diane, despite her fear of bugs, annihilated them with Creation, leaving Friesia baffled and the Serpent's Sin of Envy decided to deal with the rest of the Weird Fangs herself. Golgius, having used Friesia's attack on the town as a distraction, infiltrated Dr. Dana's clinic and attempted to steal Meliodas' broken blade and Elizabeth after the doctor poisoned the captain of the Deadly Sins but soon fled for his life after being threatened by a miraculously revived Meliodas' raging black aura. Golgius would later run into Meliodas, Elizabeth and Hawk, and soon attacked them. Though he had an upper advantage, he was soon defeated and fled back to the dungeon.

Despite the setback, Ruin decided to join in the fray and used his hypnotic illusions on Diane and then Meliodas into thinking that either of them is him, thus beginning a destructive battle between the Sins. Friesia also joined too, as she used her bugs to attack a farmer's son, to taunt Elizabeth of her resolve to save people. But the princess of Liones walked right into the swarms of bugs, not caring whether she might die only caring to save the boy. It is revealed that the boy Elizabeth just saved from Friesia is actually Ruin in disguise and the Holy Knight nearly beat her to death. Though moved by her courage, Ruin reveals the secret behind his abilities, only to reveal that the girl had removed the bell from his staff with her teeth, which caused the Holy Knight to go berserk and attempted to kill her off, but Meliodas, having been freed from the hypnotic illusion, intercepted his attack just on the nick of time. This exploded into an all-out battle between the Weird Fang and the Deadly Sin, as Ruin angrily wonders why the kingdom fears such a small child and taunts him to use his weapon as he repeatedly pummels the latter to the ground with his metal fists. Believing that his merciless attacks made Meliodas beyond recognizing, he was punched back real hard and his armor broke by the latter, revealing to be completely unharmed. Casting off his armor, Ruin claims that his incredibly hardened skin is his true armor only for Meliodas to punch him in full power, breaking through his ribs and coughed up blood. The power of such a punch from the Dragon's Sin of Wrath sent the Holy Knight flying into Baste Dungeon, destroying large sections of the prison, left for dead. Friesia, on the other hand, was smashed to near death into the ground with her armor nearly destroyed by Diane, already being freed from Ruin's illusion.

Meanwhile, Jude went to intercept Ban who just escaped from his cell and found him at Sennett's cell. The Holy Knight attacked the Fox's Sin of Greed and had him cornered, telling him that his role to lure the Seven Deadly Sins is over and will be eliminated. However, Ban reveals his reason why he lets himself captured 5 years ago and being tortured by Jude only to feel alive if he does so. The Fox's Sin of Greed removed the weapon from his chest and stabbed the Holy Knight to death. As Jude made his last words stating that if the Seven Deadly Sins were to plot to overthrow the kingdom again, the Holy Knights of Liones will declare war against them, Ban happily claims that it might really be enjoyable if that happens.

Running out of options to defeat the Seven Deadly Sins, Golgius resorted to use the Incantation Orb to cast the Eternal Seal Spell on Baste Dungeon, claiming that not even ten Tyrant Dragon couldn't break out from such a powerful sealing spell including the Sins themselves. This, however turns out to be a failure, as the sealing spell surrounding the dungeon was destroyed due to Meliodas' and Ban's way of greeting and arm-wrestling. Their antics destroyed the whole dungeon and freed the people who were wrongfully imprisoned by the Holy Knights. Golgius and his subordinates expressed their shock and panicked, fearing for their lives.

Trivia
Weird Fangs
 * Despite being a unit, the Weird Fangs didn't battle the three of the Seven Deadly Sins together, preferring to take them down separately, however it resulted in their downfall.