Axolotl Wyrm

Amphibious. The wyrm can breathe air and water.

Legendary Resistance (2/Day). If the wyrm fails a saving throw, it can choose to succeed instead.

Multiattack. The wyrm can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (2d10 + 3) piercing damage plus 4 (1d8) acid damage.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 3) slashing damage.

Tail. Melee Weapon Attack: +8 to hit, reach 15 ft., one target. Hit: 12 (2d8 + 3) bludgeoning damage.

Frightful Presence. Each creature of the wyrm's choice that is within 120 feet of the wyrm and aware of it must succeed on a DC 16 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Sludge Breath. The wyrm spits out a torrent of toxic water at an enemy. It deals 12 (1d6+3) poison damage except it doesn't acknowledge immunity to water and deals extra damage too fire elementals. Fire newts have an immunity to this power. It can only be used twice per day.