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Elemental Focus
After landing a non-periodic critical strike with a Fire, Frost, or Nature damage spell, you enter a Clearcasting state. The Clearcasting state reduces the mana cost of your next 2 damage or healing spells by 40%.
Your next 2 damage or healing spells have their mana cost reduced by 40%.
Duration: 15 seconds
After landing a non-periodic critical strike with a Fire, Frost, or Nature damage spell, you enter a Clearcasting state. The Clearcasting state reduces the mana cost of your next 2 damage or healing spells by 40%.
Elemental Focus is a Shaman talent that gives you a Clearcasting state after any critical damage spell hits a target. The Clearcasting state lasts 10 seconds, and the next 2 damage spell will cost 40% of mana costs.
Edit
Patch 3.2.0 (2009-08-04): Tooltip revised to indicate it does not work with critical strikes from periodic damage. 
Patch 2.3.0 (2007-11-13): Now reduces the mana cost of the next 2 damage spells by 40%.
