Anti-Monitor

The Anti-Monitor is a formidable entity known for his role as a universe destroyer, particularly during the Crisis on Infinite Earths. Originating from the Antimatter Universe around 13 billion years ago, he aimed to annihilate all positive matter universes to expand his own dominion. He unleashed devastating antimatter waves, resulting in the destruction of countless universes and the loss of trillions of lives. Despite being defeated, he was later reborn and became the Guardian of the Sinestro Corps, showcasing his enduring threat to the multiverse.