Evocation is a mage ability learned at level 40 for those with the arcane specialization. It is a mana regenerationutility spell that allows a mage to recover mana very quickly, even in battle. The spell is channeled over six seconds; the mage cannot take another action, else the channeling will be interrupted, as with all channeled spells. Any damage taken (excluding active DoTs) may reduce the channeling time, which in turn reduces the amount of mana gained. "Evocate" is often used as a verb; to evocate is to channel the Evocation spell.
Evocation restores a fixed amount of mana based on the mage's total mana pool, including all current buffs and gear which increase this total. Mana is restored at a rate of 15% of the mage's total mana every two seconds, for a total of three ticks over six seconds, or 45% mana in total.
Evocation is excellent for longer fights, such as PvE raid boss encounters. It reduces mages' need for a large mana pool, allowing them to focus gear on other areas such as damage output.
Items in the weapon slots (main hand, off hand, and wand) can be swapped while in combat. The amount of mana restored on each tick is based on the current maximum mana. Swapping weapons to ones with high intellect, thus raising the maximum mana value while evocating can increase the amount of mana restored. This can be accomplished with a macro, or with an add-on that does it automatically.
Patch 6.0.2 (14-October-2014): Evocation is now available only to Arcane Mages.
Patch 5.2.0 (5-Mar-2013): For Arcane Mages, Evocation now restores 40% (was 60%) of total mana over 6 seconds, and consumes all Arcane Charges. For each Arcane Charge consumed, the total amount of mana regenerated is increased by 10%, up to a maximum of 80% over 6 seconds. Evocation remains the same for Fire and Frost.
Patch 4.0.6 (8-Feb-2011): Evocation was returning less mana than the tooltip stated it should. This has been corrected.
Patch 3.0.8 (2009-01-20): Cooldown reduced to 4m, and the talent Arcane Flows reduces this cooldown further by 1m/2m.
/Patch 3.0.2 (14-Oct-2008): Evocation has had its cooldown reduced from 8 minutes to 5 minutes.
Patch 2.3.0 (13-Nov-2007): Evocation now regenerates 15% of total mana every 2 seconds rather than increase Spirit based regeneration.
Patch 2.2.0 (25-Sep-2007): The animation for the spell was changed to the new animation also used for Cyclone, only blue.
Patch 2.2.0 (25-Sep-2007): Abilities that grant a power increases (such as Evocation) were changed to guarantee a consistent number of ticks of regeneration at the increased level. For Evocation, this means that as soon as the spell is cast, a single tick of mana regen will be awarded at the normal level, then exactly 2 seconds and every 2 seconds after, the 1500% of mana regeneration will be returned, guaranteeing a full 4 ticks of increased regen every time. Previously, with unfortunate timing, increased mana would be returned on only 3 ticks.