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Magic is a broad term. It mainly covers mana and spells.

Mana
Mana is the energy absorbed into the aura, and used for spells. Most places have mana flowing through them. When too much is absorbed, it can become low-mana, which is dangerous.

Essence
Essence is a solid, visible form of mana that can be absorbed by a mage or a scroll. Essence is diluted and cut into coins to make tokens.

Spells
A spell is a manipulation of mana to produce an effect. Spells can be hand-cast, using hand symbols, or scroll-cast, using written symbols. Scroll-casting absorbs mana from the surrounding area, usually from an essence block.

Aura
The aura holds mana and can be used to cast spells. The green aura has a defense and mana of 128, and a regen of 1/sec. These are multiplied by the other. For example, a blue aura has a mana of 512, mana regen of 4/sec, and a defense of 32 with a health regen of 1/4 sec.

Within the magical community, auras of blue and violet are considered gifted, while auras of orange and red are considered disabled. A carnivore with a cyan aura is gifted, and an herbivore with yellow aura is disabled.