Divine Fortune( Player's Handbook II, p. 88)
With a quick prayer, you channel divine energy to help resist a spell, poison, or other deadly effect.
ability to turn or rebuke undead, Divine caster level 5th,
As an immediate action, you can expend a turn or rebuke undead attempt to gain a +4 bonus on your next saving throw. If this benefit is not used immediately, it lasts until the start of your next turn.