The linnorm expels poisonous icy fluid in a 120-foot line that is a 5-feet wide. Each creature in that area must make a DC 20 Constitution saving throw, taking 72 (16d8) poison damage on a failed save, or half as much damage on a successful one. On a failed saving throw, the freezing liquid quickly hardens to sheets of ice, causing the creature to be restrained for 1 minute. On its turn, a restrained creature can use its action to make a DC 20 Strength check, freeing itself on a success.