After offering a lesser soul gem, a head of lettuce, and some yarn to Sheogorath, he wants the Hero to fulfill a prophecy about the end of the world in the small settlement Border Watch. They are to simulate a prophecy by committing two acts. They should speak to the shaman in the settlement to learn about the K'Sharra Prophecy.
He plays an important role in the quest. His role includes laying out Rat Poison which is used later on in the quest.
Ri'Bassa's name may be spelled incorrectly. This can be infered due to the fact that his house is "Ri'bassa's House" and not "Ri'Bassa's House".