Archer
Bard
Beast Tamer
Berserker
Black Mage
Alchemist
Dark Knight
Hunter
Brawler
Gambler (maybe)
Gunner
Mimic
Assassin
Battle Mage
Paladin
Red Mage
Swordsman
Scholar
Summoner
Time Mage
White Mage

(Descriptions of classes to come later)

Mana - The life force of the planet and exists in the atmosphere. It is produced by the world itself. Though Mana is usually found in great quantities, it takes a long time to replenish once it is used up. this is the energy that mages often use in order to use magic. This doe not determine the type of magic used, however. Mana is raw energy, meaning it can be used regardless of magic type.

Od - The energy found within living organisms such as humans and animals. Once depleted, the Magic Circuits that are stored in the human soul will begin to replenish it. Od is produced as long as one lives, but the amount a person can store varies from individual to individual. The difference between mana and od is their abundance. Mana can be found almost anywhere and in great quantities, where s od is the energy inside humans and animals, so it is much smaller in amount. Od is measured in units; the more od a mage has the more of a knack for magic they have (the logic behind that being if the mage has higher od in their body, their magic ircuits are better adapted to high amounts of magical energy and can therefor use more of it at a time). The average mage has 25 units of od.

Magic Circuits - A pseudo-nervous system that spreads itself through the human body and what qualifies a person to be a magus. Their normal functions are to act as paths that convert mana and od into magic. Magic circuits also determine the type of magic being used.