Quote Originally Posted by Redbeard View Post
I guess im more worried about different classes etc. Archon and bard both have a -10% ability cost aura. Lots of o different classes have endurance buffs, or str buffs, etc.
Anthem of Fervor is a 1 hour buff - the archon equivalent isn't an aura it's a passive self buff based on how many auras you run - and they do stack on the Archon.

Things that I know Archon overwrites?

Earthen Barrage will overwrite any crit buffs even if they're longer duration since the buff is by far, the best crit buff in game, 30% crit for 8 seconds, 30 sec cd.
Burning Purpose overwrites other cast time reduction buffs.
Volcanic Bomb will overwrite more powerful spell damage buffs, which is a bug.
Shared Vigor will overwrite other endurance buffs if talented (which you want to do to make sure you get your passives for # of auras run)
Arcane Aegis will do the same as above.