Adui
This book is one of the best books I've ever read in this genre to be honest. The pacing even though in the time in the book seems like it's only been a short time for the man to have gained this level of strength you have masterfully crafted the universe to where none of it seems unearned or unexplained. You're doing a fantastic job keep it up.
i hope he abandons the dark universe, uses the cosmic treasure to absorb all galaxies into his infinite galaxy to create an infinite universe. Then he can discreetly travel to the primordial cosmos to continue powering up. He can probably use the cosmic treasure to shield the infinite "universe" from the sea of ruination.