You unleash the beast within and take on a savage countenance.

Encounter ✦     Healing
Minor Action      Personal

Requirement: You must be bloodied.

Effect: Until the end of the encounter, you gain a +2 bonus to damage rolls. In addition, while you are bloodied, you gain regeneration 2.
Level 11: Regeneration 4.
Level 21: Regeneration 6.

Published in Player's Handbook 2, page(s) 16.