I just finished reading up on the power, and it said that you cannot unmake yourself, but it's still pretty messed up. Anything you erase will either be replaced or layered over as if it had never been there to begin with. What is gone will never be again, so let's say I decided to eliminate the concept of reality... Then everything would be -blam!-ed but me, and even then I could unmake myself, so I'd be stuck in a nothingness for all eternity.