Pritibee was a desert planet located in the outer rim of a globular cluster. The novel speaks of this place as "the planet of a million suns", becasue the cluster is so huge and it literally contains a million suns bound by gravity. This cluster is in actual reality known as M15 (to astronomers).
The planet Pritibee was home to an ancient civilization of superstrong beings, who called themselves the Warriors of the Night. It is featured in Part 2 of the First Ark saga, The True Price of Immortality.