Power:Vow of Revenge

Vow of Revenge
Oathsworn Class Feature [Vow]
Free Action
Cost: XXX
Limitation: You may only have one Vow active at a time.
Trigger: A creature attacks you or an ally within sight.
Effect: You vow revenge upon the triggering creature. For the duration of the vow, you gain a +2 Power bonus to Attacks against the triggering creature. When the creature is defeated, you vow is fulfilled and you shift Tide of Battle one point in your favor.
Special: If you make an attack on any creature other than the target of your vow, your vow is immediately broken and you suffer a -1 penalty to Attacks until your next Rest.