You can transform your body in monstrous ways, growing fangs and claws, increasing body mass primarily through muscle tissue. You are turned into a horrifying visage of a blood-crazed beast. You lose the ability to speak, but you now possess Claws, Fangs, Iron Physique (physical injury) and Strong to a value equal to this trait for the duration of the shapeshift.
For each round that you are transformed, you suffer one point of shock. You ignore shock and wound debilitation for the duration, but must still make a physical save against the shock each round. If you fail the check, your body gives up due to exhaustion and you transform back, suffering 3 wounds from the ordeal.
The transformation takes a full round to complete.