Ermot is the mutant pet snake of Rhea of the Cöos. He is not especially big, and is quite smooth and sleek with shimmering green scales. He is also venomous, with four sets of fangs; Rhea appears to use his venom as a mild intoxicant, as she became pleasantly dizzy after consuming a small amount. When Rhea sent out Ermot to attack Roland Deschain and Cuthbert Allgood (under their aliases of Will and Arthur), Roland shot the snake dead.