The aleged "magic" is drawn from the power of the gods (see : Various gods of Sorrven). They will grant you use of their powers by worshiping them. Different races do it different ways and different gods prefer different forms of worship. (See : Religion in Sorrven.)
There are certain individual's that come directly from the line of the god's, they are commonly called; Ulues-eliel's. Which is Kylor for chosen. They are favored by the gods and recieve special abilities no one else has.
The god Svenwul-Dyecon is in power of all the gods, and grants all different types of powers, along with a longer life and good health.
Hazor will grant powers of elementel attacks if put into a situation in combat, as well as Ziph and Grond. Etcetera...
You will find more effects of the gods and what they require in "Religion in Sorrven"