Acidifying. All water outside of a creature's body within 20 feet of the acidifier is turned to acid. At the beginning of the acidifier's turn, any creature fully submerged within range takes 7 (3d4) acid damage, any creature in heavy rain takes 5 (2d4) acid damage, and any creature in light rain takes 2 (1d4) acid damage. This only affects water outside of a creature's body - drinking the acid will turn in back into water. Any acid that exits this radius immediately turns back into water.

Tentacles. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:  5 (2d4) bludgeoning damage + 5 (2d4) acid damage. If the target is a creature, it is grappled by the acidifier (escape DC 14), and the acidifier can't use its tentacles on another target.

Vomit Acid. Ranged Weapon Attack: +5 to hit, range 10/20 ft., one target. Hit: 7 (1d8 + 3) acid damage. This attack does not work underwater.