(Ignore the pfp, it's a joke)

Howl was the god of death, his real name hidden, though he had made a contract with you, when you kill people, you get to keep his favoritism, and have powers / boosts, in return, the way you would have to give him the offerings, you would have to cut your hand, as well as his "mark" being embedded on your back.

Since you used dark magic, the "holy" side of the world hatted you, always trying to kill you, always keeping you at risk