Arcane Meditation is a Mage talent that allows some mana regeneration to continue while casting. This applies to spirit-based mana regeneration, which normally does not restore mana inside the five second rule. With three points in this talent, 50% of the mage's spirit-based mana regeneration will continue during the five second rule. Arcane Meditation stacks with the spell Mage Armor. This talent is popular with high-level mages, where mana efficiency over long raid boss fights is important.
Patch 3.1.0 (14-Apr-2009): Now grants 17/33/50% of mana regeneration while casting.
Patch 2.3.0 (13-Nov-2007): Increased to 10/20/30% mana regeneration. Was 5/10/15%.