Derendil was a quaggoth inhabiting the Underdark during the Rage of Demons[as of when?].
Thanks to the influence of the demon lord Fraz-Urb'luu, Derendil believed himself to be an elven prince of the Nelrindenvane kingdom in the High Forest who was polymorphed into a quaggoth by an evil wizard. Nobody could convince him that his story was false.
Derendil was captured by drow slavers of Velkynvelve during the Rage of Demons.
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Christopher Perkins, Adam Lee, Richard Whitters (September 1, 2015). Out of the Abyss. In Jeremy Crawford ed. (Wizards of the Coast), p. 6. ISBN 978-0-7869-6581-6.