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What type of planet is the planet in the Dark Adeptus novel?
The name of the planet is Chaeroneia. It phases in and out of the warp.

maybe a transfer-world?

Greek mythology:
charon=the ferryman
river styx=divides the living and the Underworld

40k:
charoneia=>ferry between realspace and Warp
styx:the border between realspace and Warp

Seems like this Planet is a ferry.
Planet type=Taxi ?

Wow I didnt even think of all that. Good call.