Essence of Ether

Adventuring gear, poison (inhaled)

• Properties: Poison
• Cost: 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.

Source: Dungeon Master’s Guide p. 258. Available in the SRD