Been leveling DRK recently, and had an idea for improving them to bring them closer to the level of the other tanks (I haven't had any problems with DRK so far, but every other tank class getting upgrades has left it a bit behind)

My idea is after you use oblation, your next quietus or bloodspiller gives you a shield (quietus for each enemy hit, bloodspiller a flat amount similar to WHM's divine benison), I feel this would be a suitable equivalent to nascent flash, where in dungeons it's good for big pulls, but isn't overpowering in a raid setting. Would also give DRK a bit more flavour against the other tanks than just getting a cooldown with healing. The shield being tied to oblation means it can't be overused.