Substance is one of two body types of familiars. Familiars of Substance have a tangible, physical form. These familiars are generally of Glamour, Sorcery, and Alchemy. Substance familiars are vulnerable to certain status effects, such as Grimalkin's Sleep spell. In exchange, however, Substance familiars can receive positive effects, such as the healing magic of Elves. While these properties mostly remain unchanged, certain familiars have spells and abilities to change this, such as Skullmage's Astralize.
List of Substance familiars: