One of the Nine. Hermit Avatara, wielder of the Nature Dreams.
Cu Roi is one of the Nine, with powers over the Dreams of Nature. He does not normally associate with men, but with the wild beasts and the Forest Giants. He wars against Balor to save forest and to save nature. He can communicate with animals, can control the plants and life itself. Of the Nine, he brings to the table a unique perspective on the workings of the land, the deeds of men and the wars of Balor. Unlike the other Nine, though, he does not actively fight unless he must. He chooses instead a passive resistance – building of defenses, the seeding of new forests, and the establishment of new life. But in time, even he came to recognize that it was not enough, and so joined the cause of Alric, and promising him the powers of the Wilderness would be turned against Balor.
"Upon the shoulders of the Forest Giant rode a man in furs, with eyes that looked as ancient as the forest itself... at his feet ran a pack of wolves, and behind a host of other creatures from the wood."
Cu Roi was powerful yet he could not escape the destruction of the Tain with Murgen. He and Murgen were both sacrificed.
Cu Roi's powers were much like Durak's powers. Cu Roi could fire bolts of white energy at will, he could summon a wolf spirit that could blow up opponents with a magical howl, he could transform into a Forest Giant, he could summon roots from the ground in Forest Giant form, and he could fight with his staff in hand to hand, but preferred to transform into a Forest Giant if things got too close. Cu Roi could also summon hawks for scouting and could use roots to heal or attack units.