Potion common
This potion is a dark purple and black liquid with the consistency of hot tar. If you drink this potion, you must make a DC 10 Constitution saving throw, which you can choose to fail. On a failed save, you immediately become unconscious and stop breathing and your body become indistinguishable from a corpse.
However, you retain your sense of hearing and touch as well as your awareness of your surroundings via those two senses. You also retain your current hit points, abilities, and spells. You no longer need to breathe and automatically succeed any saving throws caused by harmful gases or vapors (such as cloudkill or stinking cloud effects, inhaled poisons, and the breath weapons of some dragons).
The effects of this potion last for one hour. You cannot willingly end the effect and remain unconscious for the entire duration or until you are harmed.