Invisible in Water. The weird is invisible while fully immersed in toxic brew.
Brew Bound. The weird dies if forced to leave the basin of toxic brew it inhabits, or if a purify food and drink spell is cast on the brew.
Poisonous Body. A creature takes 10 (3d6) poison damage at the start of each of its turns while grappled by a poison weird.
Constrict. Melee Weapon Attack: +5 to hit, reach 10 ft., one creature. Hit:13 (3d6 + 3) bludgeoning damage. If the target is Medium or smaller, it is grappled (escape DC 13) and pulled 5 feet toward the poison weird. Until this grapple ends, the target is restrained, the poison weird tries to drown it, and the poison weird can't constrict another target.