Adds a timer next to nameplates that displays how many seconds you have remaining to use Overpower. This aura supports Glyph of Overpower, making it trigger when your target dodges or parries. However, it does not show Taste for Blood procs since those can be used on any enemy. If you want to see those, check out my other Warrior WeakAura which shows a lot more information and complements this one well.
This aura is particularly useful in PvP because it allows you to keep track of who you can use Overpower on while hitting other targets.