Magic on Aerthos is drawn from the caster's internal reserves (mana) and channeled through the Ley Lines, and is categorized into six fundamental philosophical and practical Schools.
All spells require a combination of Intent (the mental focus and will of the caster) and Mana (the internal magical energy). The School of Magic determines how that Intent shapes the Mana.
Mastering a school of Magic is extremely difficult, and most mages either learn an intermediate level of multiple schools or focus solely on one.
There also exists a secret eighth school of magic, kept very secret. Very few people know of it, as it is dangerous and kept only to The Conclave.