Fumigate

Conjuration cantrip

Classes: Druid, sorcerer, warden, warlock, wizard
Casting Time: 1 action
Range: 30 feet
Components: V, S
Duration: Concentration, up to 1 minute

A cloud of noxious gas forms in a 5-foot-radius sphere centered on a point of your choice within range. Any creature that starts its turn within this gas must make a Constitution saving throw, taking 1d10 poison damage on a failed save. A creature that both starts and ends a turn within the area of the gas must make a Constitution saving throw or become poisoned for 1 minute. A creature poisoned this way can repeat the saving throw at the end of each of its turns, ending the effect early on a successful one. On each of your following turns, you can use a bonus action to move this cloud 5 feet. The distance you can move the cloud increases by 5 feet when you reach 5th level (10 feet), 11th level (15 feet), and 17th level (20 feet).