Cryo Blast

You fire a burst of arcane cold from your outstretched palm in a Line that is 20 ft. long and 5 ft. wide. Each target in that area must make a Dexterity saving throw, taking 2d10 cold damage and have their movement speed halved for 1 minute on a failed save, or only half as much on a success. If the target fails the save by 3 or more, they are instead restrained by ice formations for the same duration. These ice chunks can be destroyed, have 6 hit points, are immune to psychic, poison, and cold damage, and are vulnerable to fire damage.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 2.