Fantasy Young Celestial Wizard [Celestial Grimoire, Harry Potter]

Harry Potter gains the Celestial Grimoire on the night of his parents' death. Character development, power exploration and philosophy-based breakthroughs of magic and self. Omniversal travel to other worlds.

The Celestial Grimoire is a System through which an ability or item from any possible universe is rolled every X number of words written, which is then granted to Harry.