The DC Multiverse is a big place, and there are plenty of ways to bring a dead character back to life ... and it was even reanimated once with a Black Lantern ring. It's fully possible that ...

Krona's curiosity led to the creation of DC's Multiverse ... found its way into the land of the dead, which was ruled over by Nekron, leader of the Black Lantern Corps. Krona was revived and ...