The Strongest Sage with the Weakest Crest 31

Matthias has learned that all demons were once human before they were transformed by the transcendent arts of space monsters! No sooner has Matty defeated Myrok, the envoy of a star seraph, than a meteor crashes down from space. What's worse, the power of the transcendent art within the meteor ends up reviving Gradis the Overlord Demon —a supreme-class demon who can command armies of monsters!

Volume 31 of The Strongest Sage with the Weakest Crest manga series by Shinkoshoto.