spoiler: during the events of the final battle with Velda/Yuuki Rimmuru absorbed/refined enough of his nihlity energy to recreate the universe 10x over. Once Ramiris and Veldora found out about their good buddies limitless reserves they used him like a super high speed charger allowing Veldora to be even more reckless with his magicule consumption and Ramris to go into adult mode when boosted by Rimuru much to Ciel's aggravation.
@@damisolaademola this is the ending for the Web Novel though many key events line up between the Light Novel and the Web novel there are many key differences. As of right now the main antagonist in the LN is Feldway and maybe Ivarage, with Yuuki out of the picture and Velda nonexistent/replaced by Micheal.
