That Time I Got Reincarnated as a Slime S01 E14 The One Who Devours All

"Ascend into your true form."

The majin Gelmud makes his appearance at last. His true goal was to evolve the Orc Lord into the Orc Disaster, a Demon Lord, and have him reign over the Forest of Jura. Upon learning this, the Orc Lord takes action...