Balrog

The Balrog (バルログ) are a class of daedra encountered during the Misericordia-Illuminati Guild War in the year X772. Standing over 10-15x the size and height of humans, these beasts are formiddable, capable of tanking most physical and magical assaults and only taken down by A+ mages during the conflict.

As daedric beings, they're almost entirely immortal entities existing in the Inferno, by which by what Inferno Imperium is up for debate. These creatures were ultilized by the Illuminati against the population of Alstroemeria.