The heart of the magical industry of both the Imperium is Uncleft, a magical ore that is mined from astral freeholds. It is thought to be naturally formed from precipitation of the Worldken into physical form. When powdered and burned in magic circles, it generates an aura of magical reality that can make what is unreal real, and what is real even more so. It makes life in the Starsea possible by reshaping the void in the freehold into an atmosphere that mimics the air of the closest material plane. It is commonly used in astral starships, where it permits an ordinary ship to sail through the astral void as if it were an ocean. It can also be used as a substitute for any magical component in spellcasting and in the creation of magical items, which makes it particularly prized by Ruulu crafters.