Venomous Wave

7th-level conjuration

Casting Time: 1 action

Range: 120 feet

Components: V, S, M (a vial of poison)

Duration: Concentration, up to 1 minute

You conjure up a wave of poisonous ichor that crashes down on an area in range. The area can be up to 60 feet long, 20 feet wide, and 10 feet tall. Each creature in that area must make a Dexterity saving throw. On a failed save, a creature takes 5d12 poison damage. On a successful save, a creature takes half as much damage.

Afterwards, the area is covered in a green mist that is heavily obscured for the duration. Each creature which starts in turn within the mist must succeed on a Constitution saving throw or become poisoned for 1 minute. A creature poisoned by this spell can’t take reactions, and during its turn it can take either an action or a bonus action, but not both. At the end of each of its turns after exiting the mist, a creature makes a new Constitution saving throw, and on a success, it is no longer poisoned by this spell.

A strong wind (at least 20 miles per hour) disperses the mist after 3 rounds.