Illomo is a mage of the Seers of the Moonstone. The Avatar met him in Ultima Underworld I on the sixth level of the Abyss. Illomo spoke of how concerned he was that his friend Gurstang didn't return from his search for the Key of Truth to the seventh level. He feared that he'd been captured by the evil Tyball. Later, Garamon rescued him when the volcano erupted.