In the Thuban continuity, magic is the ability of the Chosen to affect reality, facilitated by a mana organ within their bodies and an associated liquid substance called mana.
The magic accessible to Chosen came in four kinds, labeled Body (the ability to affect physical matter; most usually living things, but very rarely the inorganic); Mind (telekinesis and any telepathic abilities more invasive than simple communication); Energy (the ability to affect and direct energy such as heat, light, etc.); and, most rarely, Dimension (the ability to manipulate the fabric of spacetime - teleportation and related abilities).