(Note: For other uses, see: Kappa (disambiguation)) In the Dungeons and Dragons fantasy role-playing game, most commonly in the Kara-Tur sub-setting of the Forgotten Realms, the Kappa is an evil creature based upon the Kappa of Japanese mythology. It resembles an almost furless, green-skinned, beaked, fiendish monkey, with a cragged depression in its head containing water which acts as its cerebrospinal fluid. The Kappa was introduced to D&D in Oriental Adventures.