Probably not the first time this has been asked for but, souleater should restore hp outside of grit.

DRK is the only tank with no form of self heal outside of tank stance, WAR has storm's path and thrill of battle, PLD has clemency, all DRK has is abyssal drain which isn't worth using unless doing a mass pull.

Even if it only restored half the HP outside of grit making it closer to storm's path and the full amount in grit making it similar to inner beast it would be better than it is now. But considering DRK has the least cooldowns of all the tanks right now I don't think even the full souleater hp drain would be too much to ask for.