I was about to dispute the whole 'the leveller is a dark god made flesh' thing until I realize it could be true...
at first lets look at him, hes powerful, close to ALL powerful if the comets on his side, controls life and death, easily as powerful as a demigod or something in most mythologies, but the real proofs in his opponent. The 9, the Avatara...
Avatara is a form of the word Avatar, which the 1 dictionary meaning is...
1. The incarnation of a Hindu deity, especially Vishnu, in human or animal form
So could they not be gods in human guise, explaining their power and their knowledge?
remember that The Black Company of which Myth was based took a lot of it's religious stuff from Hinduism (expecially in the later books)
on a side note, the Myrimidons are Undead in the sense that they should have died and continued living, much like a Lich or a Vampire or something else that just didn't die and continued living. Just because they weren't killed and raised doesnt make them any less undead...
and healing kills them and in the tag editors they're refered to as undead too, so there ;)
-General Pepper