Elemental Mastery

From WoWWiki

Elemental Mastery
Elemental Mastery Instant cast When activated, your next Lightning Bolt, Chain Lightning or Lava Burst spell becomes an instant cast spell. In addition, your Fire, Frost, and Nature damage spells a 15% increased critical strike chance for 15 sec. Elemental Mastery shares a cooldown with Nature's Swiftness.
Usable by
Class	Shaman
Properties
Type	Offensive
School	Nature
Cooldown	3 min
Talents
Talented	Yes
Talent tree	Elemental, Tier 7
Other information
Ranks	1
Related buff
Magic Elemental Mastery Cast time of your next Lightning Bolt, Chain Lightning or Lava Burst spell is reduced by 100%. Duration: 30 seconds
Related buff
Magic Elemental Mastery Fire, Frost and Nature damage spells have a 15% increased critical strike chance. Duration: 15 seconds

Elemental Mastery is a nature ability that when activated, causes you next Lightning Bolt, Chain Lightning or Lava Burst to become an instant cast spell, and gives your Fire, Frost, or Nature damage spell an additional 15% critical strike chance. This ability is talent trained, requiring 30 points in the Elemental tree, making it popular with Elemental shamans.

Notes

Elemental Mastery buff can be dispelled.

Spells that work with Elemental Mastery are: Chain Lightning, Earth Shock, Flame Shock, Frost Shock, Lava Burst, and Lightning Bolt.

Patch changes

Hotfix (2009-04-15): "Elemental Mastery will no longer allow a player to cast 2 spells instantly. ^[1]"
Patch 3.1.0 (2009-04-14): Redesigned. When activated, your next Lightning Bolt, Chain Lightning or Lava Burst spell becomes an instant cast spell. In addition, your Fire, Frost and Nature damage spells have a 15% increased critical strike chance for 15 seconds. Elemental Mastery now shares a cooldown with Nature's Swiftness.
Patch 3.0.8 (2009-01-20): Redesigned. Now increases the Shaman's critical strike chance by 20%, and decreases mana cost of Nature, Frost and Fire spells for 30 seconds. Cooldown remains at 3 minutes.
Patch 2.3.0 (2007-11-13): Elemental Mastery: It is no longer possible to get two consecutive guaranteed critical strikes from using this ability.