Out of the Abyss
A myconid Sprout
Stool is a young myconid who is a prisoner of the drow because he was previously captured by Sarith Kzekarit. Stool using telepathic spores to communicate with the other prisoners, eagerly acting as a conduit for others to talk if they do not share a language. He becomes quickly attached to those who treat him nicely and acts much like an enthusiastic younger sibling.