Frostfire

You invoke the fusion of elemental ice and fire, creating a raging inferno of icy flames that you hurl at a target you can see within range. Make a ranged spell attack against the target. On a hit, the target takes 3d8 cold and 3d8 fire damage, and must make a Dexterity saving throw taking half damage on a success. On a failed save, the target becomes encased in ice, restrained for the spell's duration.

At the end of each of its turns, the restrained target can make another Dexterity saving throw. On a successful save, the target breaks free from the ice restraint and is no longer restrained. On a failed save, it takes an additional 2d8 cold 2d8 fire damage.