You create and launch a missile of hardened ash which travels toward one creature you can see within range. Make a ranged spell attack. On a hit, the target takes 3d6 force damage and 3d6 fire damage. When it reaches the target, the ash arrow bursts into a 30-foot-radius sphere of ash centered on the target, regardless if the attack hits the target. The cloud of ash spreads around corners, its area is heavily obscured, and it lasts for 1 minute. When a creature enters the cloud for the first time on a turn or starts its turn there, that creature must succeed on a Constitution saving throw or become poisoned until the start of its next turn. A moderate wind (at least 10 miles per hour) disperses the cloud after 4 rounds. A strong wind (at least 20 miles per hour) disperses it after 1 round.