I would find it a BIT more interesting if it did a LOT more damage but COST us a lot more. Not only all our MP, but all of our HP as well. A sort of self-sacrificing move (in order to help the others).

Or if it also did a raisega.... So in the heat of battle, my comrades fall one by one. I seen that defeat is near, and reach within myself for one last desperate measure. I unleash a brilliant flash of light damaging, and stunning the foe whilst raising my friends.... before finally dropping to the ground.