1.
Magic exists in Thenia, but only a very small subset of people are born with it (
magicians).
2. Why this occurs is unknown; there doesn't seem to be a genetic or environmental component to it.
3. All magicians' magic is unique; although magical powers overlap, no magician has the same set of powers, at the same power intensity.
4. Magicians have a seemingly infinite amount of power. However, magic can be affected by a magician's mood or health.