Something that I could imagine for PLD's Clemency & Tempered Will that would create a CD combination that PLD's could add to their tank buster rotation.

Clemency
Added Effect when in Tempered Will: Doubled Cast Time, No Interrupt (unless CC'd [excluding knockback, since TW prevents that]) 20% Damage Reduction while casting.

Would make Tempered Will > Clemency a 6 second 20% damage reduction CD with an HP restore at the tail end. Tempered Will has a 2min or higher cooldown doesn't it? Would serve as a Defensive CD.