Mortlach

is a Holy Knight serving King Arthur Pendragon of Camelot.

Sistana arc
Mortlach appears in the middle of the battle between Ironside and Percival's group. Mortlach stops Ironside from continuing the fight, Ironside demands that he not interfere, but Mortlach reminds him that whoever destroyed the monsters he summoned must be someone as strong as the Seven Deadly Sins, so in the face of such a threat, it is best for them to retreat. After collecting the pieces of the Coffin of Eternal Darkness minus the Dragon Handle that Donny kept, both Holy Knights leave.