UrSkeks

The urSkeks were a race of creatures not native to Thra, characterized by their tall, luminescent appearance, psychic abilities, and collectivist society. A group of non-conformist urSkeks, known as Fallen urSkeks, were banished from their homeworld to Thra during the planet's first Great Conjunction. After a thousand trine of attempting to reform themselves, and influence the cultural development of Thra's sentient races, the urSkeks sought to purify themselves through the power of the Great Crystal during the second Great Conjunction. In so doing, each of the Fallen urSkeks inadvertently divided themselves into two separate beings; the violent, materialistic Skeksis, and the gentle, contemplative urRu.