From WoWWiki

Unleashed Rage
Causes your critical hits with melee attacks to increase all party members' melee attack power by X% if within 20 yards of the Shaman. Lasts 10 sec.
Usable By
Class	Shaman
Properties
Location	Enhancement, Tier 8
Affects	All melee attacks
Ranks	5
Requirements
Points required	35
Related Buff
Unleashed Rage Melee attack power increased by X%. Duration: 10 seconds

Unleashed Rage is a party buff that boosts the attack power of all nearby party members when the shaman has a melee critical strike.

Rank table

Rank	Attack Power % Increase
1	2%
2	4%
3	6%
4	8%
5	10%

Notes

This talent is a must-have talent for boosting a shaman's damage. Another great use of this talent is to group the shaman with other melee classes such as warriors and rogues to boost all of their damage.

Playable Classes
Classes	Death knight • Druid • Hunter • Mage • Paladin • Priest • Rogue • Shaman • Warlock • Warrior
Shaman	Shaman races • Shaman quests • Shaman abilities • Shaman trainers • Shaman talents • Shaman builds • Shaman tactics • Shaman sets
	Starting a Shaman • Shaman PvE guide • Shaman PvP guide • Shaman macros • Shaman category