Oh, i thought of something good.
You know how DRK gets Scarlet Delirium, where the next single damage he takes gets converted into a 3 minute buff of equal strength to their attack power? i.e. You get hit for 200, and you get +200 attack for 3 minutes?
Why not have a PLD version that takes the next amount of damage you take, and convert that to a defense boost for 3 minutes? You can get hit for next to nothing and get a trivial buff to defense, or you can time it for a massive TP move and get a large defense boost for 3 minutes.
You could even turn it into Defense and Magic Defense (or enmity), since a DRK's ability gives them both Attack and Magic Attack.
Edited, May 6th 2013 11:25am by KojiroSoma