Curse of the Holy Grail: Being Chased by a Human-Faced Chicken-Headed Monster at the Beginning

Humans made wishes due to the Eight Deadly Sins, and were twisted by the Holy Grail into various strange monsters. Magicians make a living by hunting them and gain power through "sacrifice" or "redemption", at the cost of their own gradual dehumanization. As a Sky Seal, my right arm can absorb the souls of thousands of monsters.