Warrior Priest (Mythic)
Your faith speeds you in battle and further strengthens your mind and confidence.
Prerequisite: Warrior Priest.
Benefit: You gain a bonus equal to half your tier both on initiative checks and on concentration checks to cast a spell or use a spell-like ability when casting defensively or while grappled. These bonuses stack with the bonuses from Warrior Priest.
Source: Mythic Adventures, p. 77