Aura is a mystical force necessary to cast spells. Powerful mages will have a high aura rating, while apprentice sorcerers may only command a few points worth of aura.
Characters are rated for their current aura level and their maximum aura level. With each magical spell learned, a character will gain one point of maximum and current aura. Current aura is depleted by casting spells, and is naturally replenished at a rate of two points per turn. Current aura will increase until it reaches the maximum aura level. Other ways of gaining current aura may be found as the mage researches his craft.
Spells are rated on the amount of aura which the casting mage must possess. Minor spells may demand only one point of aura to cast. Powerful spells may require a current aura level of ten or higher.