When the casting of this spell is complete, it creates a 10ft radius sphere of gas centered on a point you can see within range. This sphere is heavily obscured and spreads around corners. While you maintain concentration on the spell, you may use your action to either move the sphere up to 30 feet, or you can cause the radius of the sphere to grow by 5 feet.
Each creature within the sphere when it appears, or that enters it for the first time on a turn, or that start their turn within it must make a Constitution saving throw or become stunned until the spell ends. While stunned a creature is unconscious. Creatures that succeed on their saving throw against the spell's effect, have advantage on future saving throws they make to resist the spell.
If you maintain concentration for the full duration, any creature stunned by this spell becomes paralyzed for 8 hours.
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