You rarely lose concentration in combat.
Benefit(s): The bonus from Combat Casting increases to +8. Anytime you fail a concentration check, you do not lose the spell or spell slot you were attempting to use. You do not manage to cast the spell, but it remains available for you to use at a later time. Additionally if you successfully make a check to cast a spell defensively and the spell requires a ranged attack roll, that ranged attack does not provoke an attack of opportunity.
Mythic Options: The Missing Core Feats. © 2013, Owen K.C. Stephens; Author: Owen K.C. Stephens