I think Axel would consider his biggest sin the things he did during his time with his sire. He killed men, women, and children and he didn’t care. He just went on a rampage and became the thing that everyone fears.
He does have a place. He has a garden that he made for his late wife and daughter. When he goes there he relaxes as he feels them around him and it calms him down and puts him in pure relaxation mode.
