Incendiary Cloud
A swirling cloud of embers and smoke fills a 20-foot-radius Sphere centered on a point within range. The cloud's area is Heavily Obscured. It lasts for the duration or until a strong wind (like that created by Gust of Wind) disperses it.
When the cloud appears, each creature in it makes a Dexterity saving throw, taking 10d8 Fire damage on a failed save or half as much damage on a successful one. A creature must also make this save when the Sphere moves into its space and when it enters the Sphere or ends its turn there. A creature makes this save only once per turn.
The cloud moves 10 feet away from you in a direction you choose at the start of each of your turns.
Incendiary Cloud 5e 2024 vs. 2014 edition differences
The 2024 version adds "up to" to duration, includes druid class, specifies dispersal by strong wind, clarifies save timing (once per turn, on entry, movement, or ending turn), and states creatures make only one save per turn. Damage, range, and movement mechanics are otherwise similar.