Mental Agility

Mental Agility is a Tier 1 Discipline priest talent that reduces the mana cost of all your instant cast spells.

Tips and tactics
This is one of the first talents available to Discipline priests, improving their mana efficiency early on, affecting many key priest spells such as Power Word: Shield, Shadow Word: Pain and Renew. As a Tier 1 talent, it is possible for Holy and Shadow priests to talent this ability from level 71 onwards. Holy priests may benefit in particular from the reduced cost of their Circle of Healing, Power Word: Shield, Renew and Prayer of Mending, while Shadow priests will find benefit to many of their most useful spells, including Shadow Word: Pain, Devouring Plague, Shadow Word: Death and Fade.

This talent is fairly essential in a Circle of Healing build, as it significantly reduces the mana cost of one of your main healing spells. It will likewise be useful in any build or playing style that frequently uses non-free instant cast spells.