Cloudkill
5th-level Conjuration · XPHB, p. 251
Description
You create a 20-foot-radius Sphere [Area of Effect] of yellow-green fog centered on a point within range. The fog lasts for the duration or until strong wind (such as the one created by Gust of Wind) disperses it, ending the spell. Its area is Heavily Obscured. Each creature in the Sphere [Area of Effect] makes a Constitution saving throw, taking 5d8 Poison damage on a failed save or half as much damage on a successful one. A creature must also make this save when the Sphere [Area of Effect] moves into its space and when it enters the Sphere [Area of Effect] or ends its turn there. A creature makes this save only once per turn. The Sphere [Area of Effect] moves 10 feet away from you at the start of each of your turns.