The Anti-Monitor

The Anti-Monitor is an enemy not only of the Green Lantern Corps, but also of the entire Multiverse. Billions of years ago, on the planet Maltus, there existed a race of blue-skinned and near immortal beings later to be called the Guardians of the Universe. One of these beings, Krona, was a scientist obsessed with the origins of the universe, even though a taboo existed amongst his people concerning the viewing of the origins of the universe.

Krona created a machine that allowed him to see into the moment of creation. Somehow, his experiment disrupted the process of creation, with terrible consequences. The exact consequences have been rewritten over the years; originally, it was the unleashing of evil itself in the universe; later, it was assumed to be the creation of the evil antimatter universe of Qward.