Hunter · Beast Mastery · tier 6 · from level 35 · needs 5 points in Ferocity

Frenzy

Rank 5/5

Gives your pet a 100% chance to gain a 30% attack speed increase for 8 sec after dealing a critical strike.

Doesn't change the damage or healing of any Hunter spell.

Averages, counting crits and misses, for a level 60 Hunter with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.