Fusion between a human and caterpillar. The writhing, fleshy "horns" of the Caterpox are lined with fragile bristles containing a necrotic venom, inflicting organic tissues with a rapid spreading cellular breakdown or "crawling rot." The monster can shed its largest horns at will, which continue squirming for several days and violently flail when disturbed. It spins a tough silken casing in which to sleep, and will weave its bristles into the lining to discourage intrusion. A happy Caterpox emits what sounds like pained whimpering.