Thaw

You melt an area of ice and snow that you can see within range. Three 10-ft. cubes anywhere within 30 feet of you are instantaneously melted. The resulting water is not magical and will refreeze normally.
   Instead of melting ice and snow, you may choose to instead target a single creature with 30 feet that is made of ice or snow such as an ice mephit or a simulacrum. The creature must make a Constitution saving throw. On a failed save the creature takes 3d6 fire damage, or half as much damage on a successful one.
   At Higher Levels. When you cast this spell using
a spell slot of 2nd level or higher, you may affect an additional 10-ft. cube or increase the damage by 1d6 for each slot level above 1st.