Legendary Resistance (3/Day). If the abdolopulse fails a saving throw, it can choose to succeed instead.

Magic Resistance. The Abdolopulse has advantage on saving throws against spells and other magical effects.

Camouflaged Scales. Any time the Abdolopulse is targeted by an attack by a hostile creature, the creature must succeed on a DC 12 Wisdom check or automatically fail the roll to hit.

Aquatic Disaster. Whenever the Abdolopulse moves while in water, it will cause large waves to form that pull all Huge or smaller creatures who fail a DC 18 Strength saving throw into the water with it.

Multiattack. The Abdolopulse can use its Toxic Breath. It then makes four attacks: one with its slam, one with its sting, and two with its gnaw. It can use its Bury instead of its slam attack.

Gnaw. Melee Weapon Attack: +20 to hit, reach 10 ft., one target. Hit: 35 (6d6 + 12) piercing damage. If the Abdolopulse hits the same creature with two gnaw attacks, the second attack has advantage on the damage rolls.

Slam. Melee Weapon Attack: +18 to hit, reach 20ft., one target. Hit: 26 (5d6 + 10) bludgeoning damage.

Sting. Melee Weapon Attack: +16 to hit, reach 30ft., one target. Hit: 20 (3d8 + 10) piercing damage and 25 (6d4 +15) poison damage. If the target is a creature, it must succeed on a DC 16 Constitution saving throw or be paralyzed.

Hypnotic Pattern. The abdolopulse rapidly changes the colors of its scales hypnotizing those who directly view the creature and making them charmed unless they succeed a DC 16 Wisdom saving throw.

Toxic Breath. Each creature within 60 feet of the abdolopulse and must succeed on a DC 20 Constitution saving throw or become poisoned for 1d4 minute(s). A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the Abdolopulse is still within 60 feet, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature gains advantage against the abdolopulse's Toxic Breath for the next 24 hours.

Bury. The Abdolopulse makes one slam attack against a creature of their choice that's underwater alongside it. If the attack hits, the target takes the slam's damage then the is buried in the seafloor rendering them restrained. After being buried the buried creature can make a DC 15 Strength check. breaking free on a success and losing the restrained condition.

If a friendly creature is within 5 feet of a buried creature, they have the opportunity to give the creature advantage on their next strength check as well as reducing the DC of the check to a 12.

The abdolopulse can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The abdolopulse regains spent legendary actions at the start of its turn.

Attack. The abdolopulse makes one sting attack or gnaw attack.

Move. The abdolopulse rises or descends a distance equal to half its speed.

Crush (Costs 2 Actions). The abdolopulse makes one slam attack or uses its Bury.