User blog comment:ZoshiX/Notes on Aura/@comment-16075172-20140903155747/@comment-16075172-20140903160359

Oh, also: Using magic abilities or attacks that recquire magic releases auric energy. The more power put into an attack, the more auric energy is exerted. There are several creatures who can detect auras because they evolved that way. If someone's aura is overused (Say, the aura is basically a MP bar and you use it beyond 0.) then that person's aura will engulf them (Basically the reason for all spontaneous combustions.)