The crinaea can sense water within 300 feet of it that was drawn from its bonded source within the last 24 hours. As a bonus action, the crinaea can poison up to 1 gallon of water within 300 feet of it that was drawn from its bonded source. This can even affect water that has been used to make another nonmagical substance, such as soup or tea, or water that was consumed within the last 30 minutes. The poison can affect a target through contact or ingestion. A creature subjected to this poison must make a DC 13 Constitution saving throw. On a failure, a creature takes 18 (4d8) poison damage and is poisoned for 1 hour. On a success, a creature takes half the damage and isn't poisoned.