Aboleth

Traits

Amphibious. The aboleth can breathe air and water.

Eldritch Restoration. If destroyed, the aboleth gains a new body in 5d10 days, reviving with all its Hit Points in the Far Realm or another location chosen by the DM.

Legendary Resistance (3/Day, or 4/Day in Lair). If the aboleth fails a saving throw, it can choose to succeed instead.

Mucus Cloud. While underwater, the aboleth is surrounded by mucus. Constitution Saving Throw: DC 14, each creature in a 5-foot Emanation originating from the aboleth at the end of the aboleth's turn. Failure: The target is cursed. Until the curse ends, the target's skin becomes slimy, the target can breathe air and water, and it can't regain Hit Points unless it is underwater. While the cursed creature is outside a body of water, the creature takes 6 (1d12) Acid damage at the end of every 10 minutes unless moisture is applied to its skin before those minutes have passed.

Probing Telepathy. If a creature the aboleth can see communicates telepathically with the aboleth, the aboleth learns the creature's greatest desires.

Actions

Multiattack. The creature makes 2 attacks.

Tentacle. Melee Attack Roll: +9, reach 15 ft.. Hit: 2d6+5 bludgeoning damage, or grappled.

Dominate Mind (2/Day). Wisdom Saving Throw: DC 16. Failure: the charmed condition; Success: no effect.

Legendary Actions

The creature can take 3 legendary actions, choosing from the options below — one at the end of another creature's turn. Spent actions are regained at the start of its turn.

Lash. The aboleth makes one Tentacle attack.

Psychic Drain. If the aboleth has at least one creature Charmed or Grappled, it uses Consume Memories and regains 5 (1d10) Hit Points.