Tower of Sludge

A geyser of disgusting, dark green sludge explodes from the earth in a location you specify before promptly evaporating. Each creature in a 10-foot-radius, 40-foot-high cylinder centered on a point within range must make a Constitution saving throw. A creature takes 5d6 acid damage and 5d6 poison damage on a failed save, or half as much damage on a successful one and, if it fails, it becomes poisoned for the spell's duration. While poisoned in this way, its speed becomes 0, and it can't benefit from any bonus to its speed. A creature can repeat the saving throw at the end of each of its turns, ending the spell for itself on a success.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the acid and poison damage both increase by 1d6 for each slot level above 5th.