I know the devs are trying to make the tanks all balanced, as PLD having a lot defensive CD and Party defence, WAR being selfish in dps and good self healing, DRK being DRK? I don't know I see a little difference this Job (DRK) offers, but I like it though, it could probably have a difference by supporting the party, restore their MP (Healers) or maybe absorb party MP for Party support? But I reckon this is being planned for a future Tank job, don't know, maybe?