The surface of planet Bone.
Planet Bone is second from the Sun and is a source of edible lichen, for which it is often raided by the armies of other worlds. The surface of the planet is littered with bogs and swamps and casual structures with organic, almost skeletal look. The soldiers of Bone are called Sternum Warriors and utilize organic weapons to fight enemies. The chain of command however often change, as trickery and betrayal are part of becoming ruler of Bone. The form of government is monarchy - an Empire.
The people of Bone resemble reptilloids that walk on two legs. They also posses long and flexible tail and a pair of fins that run from the head to the end of the tail. The soldiers of Bone have well developed muscles and strong, confident gait.