The Anti-Monitor was one of the most formidable foes ever faced by the heroes. In addition to possessing vast size (varying from several meters to hundreds of meters), he has destroyed and absorbed countless universes. The Monitor explains that over a thousand universes have been destroyed. Even the Spectre was unable to defeat him even after being augmented by many powerful sorcerers, including a fifth dimensional imp. Therefore, he wields enough power to destroy a universe.
Ability to create waves that have the power to unmake matter at its most basic level.
Energy Construct Creation
He's personally battled scores of the strongest heroes from hundreds of universes simultaneously without taking any damage whatsoever.
He consumed thousands of positive-matter universes to increase his power.
The Anti-Monitor also showed capable of greatly augmenting another being's powers, as he did with Psycho-Pirate, whose powers were increased to levels too much for him to handle.
He commanded an army of Qwardians and shadow demons, and had access to highly advanced technology capable of shifting, merging, or destroying entire universes.
Genius Level Intellect