This includes items and quests that can no longer be obtained or are now deprecated.
Elemental Focus
Elemental Focus
Elemental Combat, Tier 3
Gives you a 10% chance to enter a Clearcasting state after casting any Fire, Frost, or Nature damage spell. The Clearcasting state reduces the mana cost of your next damage spell by 100%.
Patch 7.0.3 (2016-07-19): Re-added and redesigned. Now causes direct damage spell critical strikes to increase the damage and healing of the next 2 spells by 10%.
Old: When you land 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 25%, increases spell damage done by 20%, and increases single-target healing done by 50%.
Hotfix (2014-01-06):Elemental Focus now increases spell damage done by 20% (up from 15%).
Patch 5.2.0 (2013-03-05): Now increases the Shaman's spell damage by 15% (was 10%).
Patch 5.0.4 (2012-08-28): Mana cost reduction of Clearcasting reduced from 40% to 25%. Now also increases spell damage done by the spells by 10%, and increases single-target healing done by 50%.
Patch 3.2.0 (2009-08-04): Tooltip revised to indicate it does not work with critical strikes from periodic damage.
Patch 3.0.2 (2008-10-14): Now also can proc off Lesser Healing Wave and Healing Wave, and can be used on all healing spells.
Patch 2.3.0 (2007-11-13): Now reduces the mana cost of the next 2 damage spells by 40%.
Previously reduced the mana cost of 1 damage spell by 60%.
Patch 2.1.0 (2007-05-22): This talent now reduces the cost of the next damage spell by 60%. It will also now trigger from bonus spells cast by [Lightning Overload].
Patch 8.0.1 (2018-07-17): Removed. 
[Lightning Overload]. 
