Incendiary Cloud

Create a 20-ft. radius cloud of embers and smoke centered within range. The area is heavily obscured. When the cloud appears, enters a creature’s space, or a creature enters or ends its turn there, that creature makes a DEX save, taking 10d8 fire damage on a failed save, or half on a success. At the start of each of your turns, move the cloud 10 ft.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.