Stool
A young Myconid who was captured and held at the Velkynvelve outpost. He had the capacity to facilitate telepathic communication between people who would not otherwise share a language. He said that his home was called Neverlight Grove, and introduced Autun to the grove in a shared dream.
Stool was killed by single sweep of one great tentacle of Demogorgon.
When the adventurers were compelled to name their group, they honored Stool by adopting the name Stool's Irregulars.