Svartos

From Tardis Wiki, the free Doctor Who reference

Svartos was a planet in the Ninth Galaxy that was tidally locked, with one side permanently in the sunlight of its nearby star and the other permanently in the dark. The planet had no sea. (PROSE: Dragonfire)

On the dark side of Svartos was Iceworld, originally a spaceship embedded into Svartos as a prison for the Proamonian criminal Kane, but he modified it to serve as a space trading outpost. Ace later arrived on Iceworld (TV: Dragonfire) in a time storm created by Halogi-Kari (PROSE: At Childhood's End) on behalf of Fenric. (TV: The Curse of Fenric)

A Hard Rock Café existed on Svartos, and Ace had a t-shirt from there. (PROSE: The Left-Handed Hummingbird)

Gabriel and Tanith later mentioned the planet while explaining the consequences of time travel to Ace. (PROSE: Falls the Shadow)

Just think, everything you've done – or haven't done – since you appeared on Svartos. The smallest actions irrevocably altering futures of a hundred worlds on which you had no right to be. Millions of potential, real futures dislocated. You – every other time traveller – guilty of genocide to an unimaginable degree. How d'you like them apples?Gabriel