Mana

Mana
Mana is the magical life-force which flows through mages. It is a powerful force of unknown origin. Every person has Mana, although only Wizards can access it. Every spell uses a certain amount of Mana, based on the power of the spell. Mana is like blood, although no-one can be simply cut open to extract Mana. If anyone uses up too much of their Mana, it would kill them in hours.

The Elves once believed mana flowed from their sun, Shial.