Arcane Cannon: Poison Spray

It takes one action to aim the cannon and one action to fire it. After the cannon has fired, it must recharge for 5 minutes before it can be fired again.

Poison Spray. The cannon expels poison gas in a 60-foot cone. Each creature in that area must make a DC 15 Constitution saving throw. On a failed save, the creature takes 22 (4d10) poison damage and is poisoned for 1 minute. On a successful save, the creature takes half as much damage and isn't poisoned. A creature poisoned in this way can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.