Blizzard

Heavy snow begins to fall in a 30-foot high, 20-foot radius cylinder within range. For the duration of the spell, the area is difficult terrain, and creatures who start their turn in the area take 4d6 cold damage. A successful Constitution saving throw reduces the damage by half. In subsequent rounds, you can use a magic action to move the cylinder up to 20 feet.

Using a Higher-Level Spell Slot. If you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each spell slot level above 3rd.