As you cast this spell a putrid, black narcotic fog fills 30-foot-radius sphere centered on a point you choose within range. The fog flows through cracks, spreads around corners, and it lasts until the spell ends.
When a creature moves into the spell's area for the first time on a turn or starts its turn there, that creature must succeed on a constitution saving throw or take 4d10 narcotic damage and take one level of exhaustion on a failed save or half as much damage on a successful save. The area within the spell is lightly obscured by the fog, causing creatures to roll wisdom perception checks that rely on sight at disadvantage. The narcotic fog also makes it Imposible for creatures to regain hit points while inside the fog and a creature's speed is reduced by 10 feet while inside the fog.
Any levels of exhaustion caused by the fog go away after the spell end.
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