Drago-Nova

You create a blast of energy that shoots from your hands in a line that is 10 feet wide and up to 300 feet long. Each creature in that area must make a Constitution saving throw. On a failed save, the creature takes 12d12 radiant damage and is knocked prone. On a successful save, the creature takes half as much damage only.

Any creature reduced to 0 hit points by this damage is disintegrated. A disintegrated creature and everything it is wearing and carrying, except magic items, are reduced to a pile of fine gray dust. The creature can be restored to life only by means of a true resurrection or a wish spell.