Burst of Savagery
Prerequisite: 21st level, shifter
Benefit: While you are under the effect of your razorclaw shifting or longtooth shifting racial power, you can end that power’s effects as a free action in order to deal 2d6 extra damage to one target you hit. When you do so, you also gain 10 temporary hit points.
Published in Player's Handbook 2, page(s) 194.