At the start of each of the vallowex's turns, each creature within 30 feet of it must succeed on a DC 15 Constitution saving throw or have disadvantage on its next attack roll or ability check as a gnawing thirst distracts it. For each minute a creature stays in the vallowex's aura, it gains one level of exhaustion from dehydration. A level of exhaustion is removed if the creature uses an action to drink 1 pint of water. A vallowex is immune to its own Aura of Thirst as well as the auras of other vallowexes.