Thief of Vartai
Named by the personal retinue of Rogue Trader Vadimass Vartai, the world is a well-kept secret due to the dangers it presents to any planetside parties.
On first inspection, the planet appears normal. Sensor data shows a planet with little life, but a oxygen-nitrogen atmosphere fully supportive of life. The surface seem to bear faint traces of buildings. closing on it, sensor data will start misbehaving. Different sensors will report different data on size, mass and such. Images on telescope, however, are consistent, if a bit unclear. They also indicate large city ruins present. However, the true strangeness does not appear until one attempts to land.
From all outward appearances, the hive-ruins appear alien, but rich, and quite a few strange and valuable trinkets have been brought back from outside the ruins themselves.
Space does not behave the way it should on the world. The closer one gets to the surface, the more space starts to bend and buckle. When outdoors, the effects are greatly diminished, but the large hive ruins are where the great mystery lies. In there, space warps beyond the limits of sanity, causing the same corridor to stretch out for miles if walked one way, but be but a step long and leading to another room the other way. Rooms are bigger on the inside than the outside, and chambers may be round on the inside but seem triangular on the outside. Rogue Trader Vartai entered the ruins personally, with a large retinue of guards, and returned after five weeks with only a twentieth of his guard and his sanity shattered. His fractured tales told of doors, big, square, shimmering doors, and of corridors and rooms and walls and so on. The crew left on Vartai's ship then named the planet and left as swiftly as their warp drives could allow, vowing to tell no-one. Vartai himself died shortly after, and so did most of his escort.