Electrocution

Electricity wreathes one creature you can see within range. The target must make a Constitution saving throw. It takes 8d6 lighrning damage on a failed save, or half as much damage on a successful one. On a failed save, the target is also sheathed in electricity for the spell’s duration.  At the end of each of its turns, the target repeats the saving throw. It takes 4d6 lightning damage on a failed save, and the spell ends on a successful one.

If damage from this spell kills a target, the target is turned to ash.