A dead world in a derelict part of the galaxy. It is called the Labyrinth world and the Singing World
Cassus, is filled with mountains, dead volcanoes, vallies, caverns, all of which make it a natural maze. It has no fauna or flora and is now littered with the dead bodies of mechanoids. It orbits a dwarf star.
Called the Labrynth and Singing world for its formations, its planet wide acoustics allow it to record and play back any loud noise on its surface.
Cassus was once used by the 'enemy' to house Horror Factories, causing the Titan forces to invade, resulting in a massive battle, the sounds of which now haunt the planet to present day.