Enrage

From wow.incgamers.com

Talent: Enrage
Effect: Gives you a % melee damage bonus for 12 sec up to a maximum of 12 swings after being the victim of a critical strike.
Statistics: Rank 1 = +5%, Rank 2 = +10%, Rank 3 = +15%, Rank 4 = +20%, Rank 5 = +25%.