User blog comment:FTWinchester/Darkness as the overall Big Bad/@comment-9249716-20160126223945/@comment-34326521-20160127175348

I was actually referring to the limits of his power and personality. Besides, Amara did say he had "virtually erased [her]" and that he was "fearful that [she] would make a more perfect creation than he". Her claim, put together with God's personality in the Bible, explains why she's not mentioned.