Bubbler

Amphibious. The bubbler can breathe air and water.

Multiattack. The Bubbler makes two attacks: one with its acid glaive and one with its bubbles. The bubble attack can be replaced with a giant bubble attack.

Acid Glaive. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 13 (2d10 + 2) acid damage. 

Bubbles. Ranged Weapon Attack: +6 to hit, range 20/60ft., 1 target. Hit: 14 (2d10+ 3) acid damage.

Giant Bubble (Recharge 5-6). The bubbler launches a giant bubble that explodes in a 15 foot cone. Each creature in the area must make a DC 15 Constitution saving throw, taking 42 (12d6) acid damage on a failed save, and half as much damage on a successful one.

Charm. The bubbler targets one humanoid or beast that they can see within 30 feet of him. The target must succeed on a DC 15 Wisdom saving throw or be magically charmed by the bubbler. The charmed creature regards the bubbler as a trusted friend to be heeded and protected. Although the target isn’t under the bubbler’s control, it takes the bubbler’s requests in the most favourable way it can. Each time the bubbler or its allies do anything harmful to the target, it can repeat the saving throw, ending the effect on itself on a success. Otherwise, the effect lasts for 24 hours or until the bubbler dies, is on a different plane of existence as the target or ends the effect as a bonus action. If a target’s saving throw is successful, the target is immune to the charm for the next 24 hours.