
1) Darkover book 2) Fictional terrestrial planet
Found on
https://www.crosswordclues.com/clue/darkover

Darkover is the focus of the Darkover series of science fiction-fantasy novels and short stories by Marion Zimmer Bradley and others published since 1958. According to the novels, Darkover is the only human-habitable of seven planets orbiting a fictional red giant star called Cottman. The word `Darkover` is a registered trademark owned by the Ma.....
Found on
http://en.wikipedia.org/wiki/Darkover
No exact match found.