Cometstrike

This spell may only be cast in an outdoor area; it fails if cast indoors or underground.

You call upon the nature of the great beyond of space and summon a volley of icy comets to strike down your foes. Make a ranged spell attack against up to three creatures within range. On a hit, each target takes 5d6 bludgeoning damage and is stunned until the end of your next turn. Regardless of if the comet hits or misses, the targets must each make a Dexterity saving throw or take 10d4 cold damage, taking half damage on a success.

On each of your subsequent turns, as an action, you can cause another three frozen comets to rain down upon targets of your choice. They can be the same targets or different from round to round.