The Mage Guild ability Equilibrium needs to be prevented from being used in Campaign or re-written, so players can not help their friends CHEAT in Campaign. I've seen players casting Equilibrium multiple times in the center of a Zerg of players of the alliance they're temporary playing in to help their friend on the opposite alliance to successfully pull off Vicious Death and to increase their chances of obtaining Emperor-ship, without honestly earning it.
Mage Guild ability: Equilibrium
Cast time: Instant
Target: Self
Barter with Oblivion to trade vitality for power, sacrificing 8400 Health in exchange for 3000 Magicka.
The exchange reduces your healing done and damage shield strength by 50% for 4 seconds