A swirling cloud of green smoke or gas appears in a 20-foot-radius sphere centered on a point within range. The cloud spreads around corners and is heavily obscured. It lasts for the duration or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.
When the cloud appears, each creature in it must make a Constitution saving throw. On a failed save, a creature is restrained as its flesh begins to harden. On a successful save, the creature isn't affected. A creature restrained by this spell must make another Constitution saving throw at the end of each of its turns, even if it is no long inside of the cloud of petrifying gas. If it successfully saves against this spell three times, the spell ends. If it fails its saves three times, it is turned to stone and is petrified. The successes and failures don't need to be consecutive; keep track of both until the target collects three of a kind. If you lose concentration on this spell, the cloud of gas disappears, but any creatures who failed their saving throw against the spell must keep making them until they acquire three failed or successful saves.
The cloud moves 10 feet directly away from you in a direction that you choose at the start of each of your turns.
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