Encasing Ice

You reach out with cold energy and cause a layer of ice to form over a creature. Choose one creature within 60 feet. The creature must make a Strength saving throw against your Spell Save DC. On a failure the creature takes 6d6 cold damage and its speed is reduced to zero until the end of your next turn. In addition, the creature has disadvantage on Dexterity Saving throws during this time. On a success the creature only takes half damage and no other effects. If the creature takes a total of at least 15 fire damage before the spell ends, it ends early.

At Higher Levels. Damage increases by 2d6 for each level above 3rd. The amount of fire damage needed to end the spell early increases by 5 for each level as well.