Let me explain GRU: He is the blood warrios have shed onto the dirt which rotts and dead boddies that have rotted in that dirt form his body. The red glow in his eyes is the blood from eons ago and he is heartless but his blood is pumped by the spirits in Hell which are his minions. He curses those who question his being and haunts them with endless nightmares. With termites in his smile and darkness in his heart, GRU truley is the king of Hell.