Stage trees are a biogenically altered life form created by the Tnuctip slave-race from one of their native tree species for the Thrint (more commonly known as Slavers) as solid-fuel boosters for their spaceships. The Thrint grew Stage Trees in massive plantations on planets with locations too delicate for the use of conventional fusion drives (which generate exhaust plumes of several thousand degrees) to lift their craft high enough that the main engines could be used without damaging the surface below. We can assume this was done to reduce the cost and that farming the trees was easier and more cost-effective than simply building boosters in a factory. After the fall of the Slaver Empire a billion years ago, the trees became wild and eventually evolved to use their rocket cores as part o