Essence of ether

[ Essence éthérée ]
inhaled (toxin) - 300 gp
A creature subjected to this poison must succeed on a DC 15 Constitution saving throw or become poisoned for 8 hours. The poisoned creature is unconscious. The creature wakes up if it takes damage or if another creature takes an action to shake it awake.
Dungeon Master´s Guide D&D 5 › Poisons