
This dreadful gas is prepared from the liver of an extremely rare sea fish called killer eye. Once released, the toxic cloud kills most creatures that breathe it.
A creature subjected to this poison must make a DC 18 Constitution saving throw, being poisoned and taking 27 (6d8) poison damage on a failed save, or half as much damage on a successful one. The creature can make a new saving throw at the end of each of its turns, ending the poisoned condition on itself on a success.