Razorworms were creatures from an alternate dimension, where they were top of the food chain. They were discovered by Persephone Grief and Barnaby, and three were brought back to a warehouse in Ireland. The two mages were then payed to send them to attack the English Sanctuary, where they were encountered by Billy-Ray Sanguine.
Powers and abilities
Razorworms have power similar to those of users of Tunnelling. Because of this, they can travel through walls and floors. They also have large mouths and strong jaws, and because they are carnivorous, this makes them deadly to humans. It is not stated within the series if they are attracted to magic, like the creatures that live in the Caves of the Void.