Can't he evolve "himself" without specifying what exactly ? It should give him evolution like Pokémon normally achieve so overall stat boost + new look
Thanks for the chapter! Really loving the story so far, I just wish the chapters were longer. It almost seems like each chapter is only a small portion of a full chapter. Keep up the great work!
Just evolve his aura as a whole instead of it's mastery and finish with a skills to manipulate life energy or something similiar or better from another media
Otherwise keep it for when he receives something super good that can only be used 1 time and use it on that