10 Most Powerful Cosmic Entities In DC Comics
8. Parallax
So, Hal Jordan. As a Green Lantern he's one of the best around, and he was obviously even more powerful as the Spectre, but he was arguably at his strongest when he was possessed by Parallax.
Driven mad by the destruction of Coast City, Hal found himself in direct opposition against the Green Lantern Corps and managed to destroy it and the Guardians single-handedly, save for Ganthet. Immediately following this, Jordan plunged himself into the Central Power Battery and absorbed all of its will, thusly becoming one of the strongest beings in the universe.
Kyle Rayner becomes the last Lantern, Hal leaves Guy Gardner in a coma, and then attempts to remake reality in his own image. He could manipulate reality, space-time, and even managed to floor Superman with one punch while possessed by Parallax. He was practically impervious to all physical attack.