Even the playing field.

You select an area with is encompassed in a 40 ft. cube of light. every living being/creature in the cube must make a Con saving throw. If the saving throw is failed then the being/creature will then lose hp equivalent to the loss of hp of the most damaged creature in the cube within the cube.(Warning allies are effected) However the creature with the most hp loss in the cube prior to the spell will not be effected.  For instance 4 goblins are in the cube . one goblin has taken 10 damage . The other have not been hit. Each goblin who fail the saving throw will lose 10 hp. The original wounded goblin will remain untouched.  Any creature who pass the saving throw will take 1d4+Wis modifier.  If a foe rolls a critical  success Nat 20 , The Foe would then gain the number of loss as temporary HP. 

This spell can only be used once per long Rest.