This poisonous gas can only be harvested from the Negative Energy Plane using powerful arcane magic. A creature subjected to this (inhaled) poison must make a DC 20 Constitution saving throw. On a failed save, it takes 23 (5d8) poison damage and 28 (8d6) necrotic damage, it gains one level of exhaustion, and it can't regain hit points for 1 minute. On a successful save, it takes half as much damage and suffers no other effects. If the creature has no more than 50 hit points and it can be poisoned, it instantly dies instead of rolling the saving throw.

Inhaled. These poisons are powders or gasses that take effect when inhaled. Blowing the powder or releasing the gas subjects creatures in a 5-foot cube to its effect. The resulting cloud dissipates immediately afterward, unless stated otherwise. Holding one’s breath is ineffective against inhaled poisons, as they affect nasal membranes, tear ducts, and other body parts.

Notes: Damage: Poison, Damage: Necrotic, Exhaustion, Damage, Debuff, Consumable