The Four Cardinals
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Although it only has been three weeks inside his divine realm, which was just a couple of days outside, within Chaos mind, it has been… hundreds of years of training. Almost a thousand.
Thanks to the power of the Elder Brain's ability to manipulate the mind, he created a powerful Mindscape, and using his incredible mind capacity, Chaos accelerated the time he could think, accelerating it hundreds if not thousands of times over… His mind ran incredibly fast compared to everything outside.
And through these weeks inside his divine realm, he never opened his eyes. Over the billions of fights he underwent against these many foes created by his mind, he gained enlightenment like nothing else.
His entire body had also been bathing constantly in rich cosmic energy, and had evolved, growing stronger, bigger, and more powerful, cosmic energy was now like his lifeblood, flowing across his body and soul as if he were made of this essence.