Poison Spores

Whenever the creature takes damage, it releases a cloud of spores. Other creatures within 5 feet of the creature when this happens must succeed on a Constitution saving throw (DC = 8 + proficiency bonus + Constitution modifier) or be poisoned for one minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. (Chamberlain of Zuggtmoy, pp. 230. OotA)