Waves of Darkness

You emit waves of darkness from you hand, damaging anything in a 75ft cone. 

Make a ranged spell attack against all targets in range, they must succeed on a DC15 Constitution saving throw or take 2d12+1 necrotic damage and 2d12+1 force damage, or half as much on a successful save.

This spell's damage increases by 1d12 for each spell slot above 5th level.