Are we sure it isn't Nekron? I mean come on; Giant interdimensional Death God? Noted for of the GLC, has an MO of using undead super heroes as minions? Making him the mastermind behind the BL makes sense, and is actually cool.
But we're supposed to believe this jackass transformed the Anti Monitor into a power ring, then resurrected a bunch of top tier DC heroes as undead ghouls and gave them rings? Really? This guy?