Frost covers your body and spreads out from you, covering the ground within 20 feet of you, turning it into difficult terrain and reducing your speed to 0 until the end of your next turn. Every creature other than you standing on that ground when the spell is cast must make a Constitution saving throw or take 4d10 cold damage and be restrained until the start of your next turn. A creature who succeeds on the saving throw takes half damage and is not restrained.

Non magical water in this area stays frozen for 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.