Seen in Rina's blending vision with thousands of Therianthrope Souls chained to a stake. The stake was in the skin of this giant devil.

Sullivan Frey said the visions are more metaphorical and not to think of them so directly.

same as Bolgroth the Conqueror, but now he is a giant devil in the afterlife.

Agronoch and Nicky and the other brothers want Rina and the bound to help kill him.