Frost forms around your body and spreads out from you, covering the ground within 20 feet of you, turning it into difficult terrain, freezing non-magical water in the area and reducing your speed to 0 until the end of your next turn.  This spell automatically fails if you are not standing on solid ground.  Every creature other than you standing on that ground when the spell is cast must make a Constitution saving throw or take 4d10 damage and be restrained until the start of your next turn.  A creature who succeeds on the saving throw takes half as much damage and is not restrained.  Water frozen by the spell melts 1d4 minutes after the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.