Toxic Pool

You create a volatile pool of poison on ground that you can see within range.

Until the spells ends, poisonous fumes fills 5 foot radius, 10 foot high cylinder. If a creature ends its turn in spells area, or if it moves through it, it must make a Constitution saving throw or take 1d6 poison damage.

The spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).