Mental Fortitude

Mental Fortitude is the second skill in 's Spirit skill branch. It gives him by 10% for 30 seconds when starting a battle against an enemy that is 3 or more levels higher than he is.

Overview
Having higher defences to start a fight basically means that it'll take longer before Reyn needs to be healed. The usefulness of this is situational; it is most effective if someone else needs to be healed relatively early on, so there is more time for the healing art's cooldown to complete before Reyn needs it.