Everybody has spiritual energy, but in the monks case it should be so powerful that it is emitted from their bodies, and able to empower both themselves and others.
In essence the auras should be like a warlords battlecry, but with much different affects, (since I\'m sure a warlord cry of some sort could easily happen also).
The affects would be different for each aura, (Geez I sound like I\'m talking about diablo II here) but they would stack on each other, (unlike diablo II) Ex:
Etheric: Extra mana regeneration - Level based
Emotional: Raises wisdom temporarily - Level based
Mental: Increases accuracy/hitroll - Level based
Astral: Increases casting level - Level based, but very small increase.
Template: Extra health regeneration - Level based
Celestial: Adds holy damage to you and your allies physical attacks - Level based
Casual: Adds damage reduction to you and your allies? - Level based
The changes should be small, but this encourages large group combat. People could only be affected by one monks affects at a time, so you can\'t have 20 monk friends pumping all your bonuses through the roof. These were just on-the-spot examples I thought up, definitely room for change.