Olympia: The Age of Gods PBEM (Oct 4 2000)
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.
Nobles are rated for their current aura level and their maximum aura level. With each magical spell learned, a noble 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 (four points per turn with an auraculum). Current aura will increase until it reaches the maximum aura level.
Other ways of gaining aura include meditation (Meditate [2801]), tapping your health (Tap health for aura [2832]), destroying artifacts (Destroy artifact [3103]), and power jewels (Power Jewel).
Current Aura may be at most 5 times the maximum effective aura (maximum aura plus aura from item bonuses).
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.