Grimiore

Grimiore is the main antagonist of Inferno Tempest: Death of Eternity.

Description
Grimiore looks like a mixture between Cthulhu and a Shoggoth, and is completely black, except the purple veins running down his body.

Role in Inferno Tempest
Not much is know about Grimiore yet, except that he's the True Ending's Final Boss.