Decapitation

You touch a creature within range. The target must make a Constitution saving throw, taking 8d6 force damage on a failed save, or half as much on a successful one. If the target is reduced to 0 hitpoints, its head(s) fly off at high speed in a random direction, and it dies instantly. The heads remain intact if they collide with something. Any creature hit by one of the heads must make a Dexterity saving throw, taking 3d8 bludgeoning damage on a failed save, or half as much on a successful one.

At Higher Levels. When cast with a spell slot above 5th level, this spell deals 2d6 more force damage for each slot level above 5th.