Mustafar is a planet steeped in a dark history, acting as a point of interest as far back as the Clone Wars themselves. At one point, the Black Sun constructed their headquarters upon its surface and later on even Darth Vader took up residence within his dark castle. The traces of this history are still found in the form of the remains left behind. Mining facilities are scattered across the lava-surface of the scorching planet, help up with gravity supports that keep them safe from the superheated material below.
Perhaps its most notable history came via a single uttered phrase: Mustafar is where Jedi go to die. The hidden interrogation facility built into the scorched stone is steeped in the dark side, providing a clue to its wicked purpose in a time not so long past. A large, single landing pad acts as the focal point of the structure from the outside. It is connected by a causeway that leads to a security door that has fallen into disuse. The facility itself is still functional, drawing power from the thermal energy of the planet itself.
Once within, one is confronted by the labyrinthine maze of corridors and offices that were clearly designed for a singular purpose. The holding cells are as spartan as any other Imperial construct, providing only a slab protruding from the wall as a bed and nothing more. Barracks can be found near the main control rooms with its shelving in various states of disarray. It is clear with only a glance that scavengers have already picked the inanimate corpse clean of its contents.
However, it is deeper still where the miasma of the dark side truly reaches its zenith. There one will find the interrogation chambers. Wickedly cruel in their singular purpose, stains can still be found caked into the durasteel panels themselves alongside various tools and instruments of the trade plied within.
To walk within Mustafar's Interrogation Facility is to tread through the ghosts of the planet's darkest past. It is a symphony for the wicked and a requiem for the pious.