Water Dependent. The Abalon can only breath underwater and takes 10 (2d10) acid damage every 10 minutes it isn't submerged underwater.

Psychedelic Mucous Cloud. While underwater, the Abalon is surrounded by a psychedelic mucus. A creature that touches the Abalon or that hits it with a melee attack while within 5 feet of it must make a DC 14 Constitution saving throw or be stunned until the start of it's next turn.

Probing Telepathy. If a creature communicates telepathically with Abalon, the Abalon learns the creature's greatest desire if it can see the creature.

Multiattack. The Abalon makes three tentacle attacks.

Tentacle. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 8 (2d6 + 2) bludgeoning damage. If the target is a creature, it must succeed a DC 14 Constitution saving throw or be stunned until the start of it's next turn.

Tail. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 9 (3d6 + 3) bludgeoning damage.

Devour Sentience. The Abalon targets a stunned creature it can see within 5 feet of it. That creature must make a DC 15 Intelligence saving throw or lose one point of intelligence and be stunned until the start of their next turn. If this reduction reduces the creature's intelligence to 0, it instantly dies. The creature regains its original intelligence after a long rest.

The Abalon can take 2 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The Abalon regains spent legendary actions at the start of it's turn.

Tentacle. The Abalon attacks with a tentacle

Stun (Costs 2 actions). The Abalon targets one creature within 20 feet of it that the Abalon can see. That creature must make a DC 14 Wisdom Saving throw or be stunned until the end of their next turn.