HE is terribly evil. Ponies by heredity are completely depraved. Nopony as to teach them sin. Every part of their nature is tainted. However this does not mean they are as bad as they could be. Some fall into a deeper level of depravity and become the pure essence and incarnation of evil. Yet nopony has fallen to HIS level.

HE is the purest and most utter evil immaginable. He has no conscience, no compassion, and absolutely no remorse. HE feeds on pain and suffering. He delights in anguish and filth. HE is cunning. The idea of him comes from Methodia, meaning methods or strategies, and he has been honing these methods for millennia. HE, himself, masquerades as a pony of light. He doesn't attack their weaknesses so much as their strengths. He gets them to rely on their own talents or giftedness instead of on SHE who gave it to them...