Aura of Frostbite

A flurry of icy wind surrounds you in a 15-foot radius. Until the spell ends, the aura moves with you, centered on you. The area becomes difficult terrain and any creature within 15 feet of you must make a Strength saving throw at the end of each of their turns while within the aura. The creature takes 2d6 cold damage and freezes to the ground becoming Restrained until the end of their next turn on a failed save, or half as much damage and are not restrained on a successful one  As an action, a restrained creature can attempt to end the effect on themselves by making an Athletics check or Acrobatics check against your spell save DC. You are unaffected by this spell's effects and are unhindered by the difficult terrain it creates.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, you can designate up to 3 non-hostile creatures within 60 feet to be unaffected by this spell.