Cloudkill

Create a 20-ft. radius sphere of yellow-green fog centered on a point within range. The fog is heavily obscured and lasts until dispersed by strong wind or until the effect ends. A creature makes a CON save when the fog moves into its space, when it enters, or when it ends its turn there, taking 5d8 poison damage on a failed save, or half on a success. The sphere moves 10 ft. away from you at the start of each of your turns.

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