Alastor

In Greek mythology, Alastor ("avenger") was the personification of familial feuds. He was also associated with sins that pass down from parent to child. As a genius, or spirit of the household in Roman mythology, he incited people to murder and other sins. He was originally a mortal, son of Neleus, King of Pylos. He was later downgraded to a minor demon after he and his brothers were killed by Heracles.