The attercroppe radiates an aura of insidious poison that slowly pollutes any water source. in which it immerses itself. Each hour the attercroppe is fully immersed in water, its aura transforms up to 10 gallons of the water into a deadly poison. A creature that drinks this poisoned water must succeed on a DC 12 Constitution saving throw or take 10 (3d6) poison damage and become poisoned for 1 hour.