Dogmaw

The system contains two large planets that orbit the star in opposite directions they are known as Overbite and Underbite. 

Though the planets themselves orbit far enough apart to do little more than disrupt each other's weather patterns when they pass, their moons and other orbital bodies are less kind. 

Known as the teeth of Dogmaw, these hurtle past each other, collide and sometimes even swap planets.  at certain times of year these can be extremely treacherous to space craft.

Both planets, and some of the larger moons, are populated with orks of many different clans and tribes.