When the blood starts pumping, the bodies start falling.
Overview
Adrenaline Rush is an ability available as a talent in the rogue's Combat tree. It instantly increases your energy regeneration rate by 100%, effectively doubling the amount of special attacks you can perform in a small amount of time.
Tips and tactics
In raid situations, try to save up your adrenaline rush if you're close to fighting a boss. Adrenaline Rush and [Blade Flurry] (another ability in the combat tree) are incredible tools for improving your burst DPS. Remember to let the tank get some threat before using this, as this can easily lead to overaggroing.
When soloing, try to use your Adrenaline Rush early on in fights — you have a much better chance to keep your target stunned and make full use of your buffs at the beginning of a fight than at the conclusion.