Stool was a myconid sprout living in the Underdark during the Rage of Demons. [ as of when?]
Stool lived in
Neverlight Grove with all its people. During the Rage of Demons, it was captured by Sarith Kzekarit, who took it to the drow outpost of Velkynvelve.
Stool's main concern was to return to its fellows. If it grew attached to
humanoid people, it acted like a curious and enthusiastic younger brother. At the hands of the drow, it felt lonely and frightened.
Thank to its spores, it could communicate telepathically with other creatures and could also act as bridge between two creatures without a common language in order to communicate.
↑ 1.0 1.1 1.2 1.3 1.4 1.5
Christopher Perkins, Adam Lee, Richard Whitters (September 1, 2015). . In Out of the Abyss Jeremy Crawford ed. ( Wizards of the Coast), p. 7. ISBN 978-0-7869-6581-6.