Shadebone is a pure white or black, smooth material created by mixing bone dust with Umbra (in the case of Black Shadebone) or Radiance (in the case of white Shadebone). It is used exclusively in the creation of Masks, because of its ability to be carved with ease and its magical capabilities.

Because of its high demand, it is the most commonly sold, exported, and produced material in the Prime Material Plane. With the exception of concrete, water, and some types of wood.