Cankerworms

These small gray worms live only in the Passage of Skeel. They have no eyes, a suction-like mouth and a body that looks like a twisted plastic bag which all the air has been vacuumed out of. They attach themselves to the torso of any creature with a long lifespan and suck the years off the life of that creature. If unnoticed, they will drain the life of their hosts over the course of one night.