Void's Tower is where the character Void lives and studies. It is located on the edge of the Greenwood, in the Southern Marches of Barcia. It is protected by "countless security spells," and the several servants residing there are under "powerful loyalty spells" which ensure their absolute obedience.
The main room of the tower is round, and crammed with strange devices and boiling pots of liquid. Dark lines are drawn on the floor in various strange patterns. A massive window permits light in through the wall. There are a variety of other rooms, as well as a massive dining hall. The inside is larger than the outside, with each successive owner having added more and more passageways and compartments, not only in the building itself but also underground.