Yepa is a strange and confusing moon that revolves around Slarth. In the sense, it is essentially a moon made of pure energy; with no visible surface.
The moon is likely considered the most volatile moon of any moon belonging to Slarth. Giant, bright geysers of pure energy explode from the surface on a regular basis. About ten are seen every twenty minutes. Not much can be said about these geysers other than that they composed of energy from deep within the moon's core. Harvesting this energy is quite impossible as the energy could burn through solid metals with ease. Any course to harvest the energy would lead to obvious death, and as such, the Elder Council has deemed energy harvesting illegal.