From WoWWiki

The Gift of the Gathering Storm is a shaman item set earned through quests from the Cenarion Circle which require you to turn in items from creatures and bosses in the Ruins of Ahn'Qiraj. You are also required to have a certain reputation with the Cenarion Circle to get the items. All items in the set are Bind on Pickup and require level 60.

Item	Armor	Strength	Agility	Stamina	Intellect	Other Effects	Reputation Needed
[Ring of the Gathering Storm]		8	9	10	11	+12 Magical Damage/Healing	Honored
[Cloak of the Gathering Storm]	52	12		10	13	+14 Magical Damage/Healing	Revered
[Hammer of the Gathering Storm]		7		10	9	+53 Magical Damage/Healing	Exalted

Gift of the Gathering Storm Totals

Armor	Stats	Resistance	Other Effects
52	Str:27 Agi: 9 Sta: 30 Int: 33		+80 Magical Damage/Healing

Bonuses gained from wearing multiple set items:

3: Increases the chain target damage multiplier of your Chain Lightning spell by 5%

External links

Wowhead
Thottbot
Allakhazam

Shaman sets
Dungeon		1: The Elements • 2: The Five Thunders 3a: Tidefury Raiment • 3b: Desolation Battlegear
Reputation		ZG: Augur's Regalia • AQ20: Gift of the Gathering Storm • AQ40: Stormcaller's Garb • Seer's Linked Battlegear • Seer's Mail Battlegear • Seer's Ringmail Battlegear
Tier (Raid)	1/2/3	The Earthfury • The Ten Storms • The Earthshatterer
	4	Cyclone Harness • Cyclone Raiment • Cyclone Regalia
	5	Cataclysm Harness • Cataclysm Raiment • Cataclysm Regalia
	6	Skyshatter Harness • Skyshatter Raiment • Skyshatter Regalia
PvP-	AB	The Highlander's Determination • The Defiler's Determination • The Defiler's Fortitude
	Rare	Lieutenant Commander's Earthshaker • Champion's Stormcaller
	Epic	Field Marshal's Earthshaker • Warlord's Earthshaker
Arena	1	Gladiator's Earthshaker • Gladiator's Thunderfist • Gladiator's Wartide
	2	Merciless Gladiator's Earthshaker • Merciless Gladiator's Thunderfist • Merciless Gladiator's Wartide
	3	Vengeful Gladiator's Earthshaker • Vengeful Gladiator's Thunderfist • Vengeful Gladiator's Wartide