Symphony of the dead

You extend your hands out towards the field in front of you and an assortment of ghostlike instruments appear and fill the area with a demonic sounding symphony any opponent that hears it must succeed a wisdom saving throw (wis 21) or take 1d8 necrotic damage. If the opponents are missing any of their hit points, they then instead take 1d12 necrotic damage.

the damages increase by 1 die when you reach 3rd lvl (2d8 or 2d12) and 1 additional die each lvl after for a total of ( 8d8 or 8d12 total