Chilling Mist

Freezing mist creeps up from the ground from a point you choose within range to fill a 20-foot-radius sphere for the duration. The mist spreads around corners, and the area is considered lightly obscured. 

A creature who enters or starts its turn in the mist must make a Strength saving throw against your spell save DC. On a success, the creature is unaffected. On a fail, the creatures speed is reduced by 15 as they become covered in frost. If a creature's speed becomes zero from this spell they become frozen and are incapacitated. A frozen creature still makes a save at disadvantage at the start of its turn.

These effects last for 2 rounds after the cloud is dispelled, or if they make a successful save, whichever comes first.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the radius of the fog increases by 20 feet for each slot level above 2nd.