The Anti-Monitor
The Anti-Monitor is one of the most powerful villains in DC comic books. In fact, he has proven fully capable of being a threat to multiple universes at any given time.
He possesses vast cosmic powers and vast reality-warping abilities, and was the main antagonist of the massive 1985-86 event Crisis on Infinite Earths, when his rampage through time and space prevented the creation of the multiverse itself.
The character is officially the most murderous in DC, having destroyed multiple universes in his time. Moreover, every time he destroys a universe, he consumes its energy and becomes even more powerful. If the Anti-Monitor wants something, he can generally tear through it like a hot knife through butter – he’s simply that powerful.

