Amphibious. The aboleth can breathe air and water.
Natural Camouflage. While in the water, the aboleth has advantage on Dexterity (Stealth) checks.
Mucous Cloud. While underwater, the aboleth is surrounded by transformative mucus. A creature that comes within 15 feet or that hits it with a melee attack while within 5 feet of it must make a DC 15 Constitution saving throw. On a failure, the creature is diseased for 1d4 hours. The diseased creature can breathe only underwater. The area of the mucous cloud is considered difficult terrain for all but the aboleth.
Elder Glyph (1/Day). After 1 minute ritual, the aboleth can create a powerful glyph on a surface it touches. The glyph is almost invisible, requiring a DC 17 Intelligence (Investigation) check to notice. If a creature comes within 10 feet of the glyph and is not enslaved by the aboleth, it must succeed a DC 17 Wisdom saving throw, taking 14d8 psychic damage on a failed save and becoming enslaved by the aboleth, or half as much and not being enslaved on a success. This enslavement ends when the creature is knocked unconscious or killed. The aboleth can have up to three of these glyphs active at a time.
Probing Telepathy. If a creature communicates telepathically with the aboleth, the aboleth learns the creature's greatest desires if the aboleth can see the creature.
Spellcasting. The aboleth is an 14th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +12 to hit with spell attacks). The aboleth has the following wizard spells prepared:
1st level (4 slots): shield, thunderwave, dissonant whispers
2nd level (3 slots): crown of madness, mirror image
3rd level (3 slots): hypnotic pattern, counterspell, lightning bolt
4th level (3 slots): evard's black tentacles, dimension door
5th level (2 slots): geas, modify memory
6th level (1 slot): chain lightning
7th level (1 slot): reverse gravity
Multiattack. The aboleth makes four tentacle attacks.
Tentacle. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 16 (3d6 + 6) bludgeoning damage. If the target is a creature, it must succeed on a DC 15 Constitution saving throw or become diseased. The disease has no effect for 1 minute and can be removed by any magic that cures disease. After 1 minute, the diseased creature's skin becomes translucent and slimy, the creature can't regain hit points unless it is underwater, and the disease can be removed only by heal or another disease-curing spell of 6th level or higher. When the creature is outside a body of water, it takes 6 (1d12) acid damage every 10 minutes unless moisture is applied to the skin before 10 minutes have passed.
Tail. Melee Weapon Attack: +11 to hit, reach 15 ft. one target. Hit: 20 (4d6 + 6) bludgeoning damage.
Enslave (3/Day). The aboleth targets one creature it can see within 60 ft. of it. The target must succeed on a DC 17 Wisdom saving throw or be magically charmed by the aboleth until the aboleth dies or until it is on a different plane of existence from the target. The charmed target is under the aboleth's control and can't take reactions, and the aboleth and the target can communicate telepathically with each other over any distance. The effect must be dispelled (DC 17 or of 5th level) to end the charmed effect. No more than once every 24 hours, the target can also repeat the saving throw when it is on another plane of existence from the aboleth.
While a creature is enslaved by the aboleth in this way, the aboleth can change the memories of the creature while enslaved as though by the modify memory spell.
The aboleth 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 aboleth regains spent legendary actions at the start of its turn.
Detect. The aboleth makes a Wisdom (Perception) check.
Tail Swipe. The aboleth makes one tail attack.
Psychic Drain (Costs 2 Actions). One creature charmed by the aboleth takes 21 (6d6) psychic damage, and the aboleth regains hit points equal to the damage the creature takes.
Spell (Costs 2 Actions). The aboleth casts a spell, expending a spell slot as normal.
Lair and Lair Actions
Aboleths lair in subterranean lakes or the rocky depths of the ocean, often surrounded by the ruins of an ancient, fallen aboleth city. An aboleth spends most of its existence underwater, surfacing occasionally to treat with visitors or deranged worshipers.
Lair Actions
When fighting inside its lair, an aboleth can invoke the ambient magic to take lair actions. On initiative count 20 (losing initiative ties), the aboleth takes a lair action to cause one of the following effects:
- The aboleth casts phantasmal force (no components required) on any number of creatures it can see within 90 feet of it. While maintaining concentration on this effect, the aboleth can’t take other lair actions. If a target succeeds on the saving throw or if the effect ends for it, the target is immune to the aboleth’s phantasmal force lair action for the next 24 hours, although such a creature can choose to be affected.
- Pools of water within 240 feet of the aboleth surge outward in a grasping tide. Any creature on the ground within 20 feet of such a pool must succeed on a DC 15 Strength saving throw or be pulled up to 20 feet into the water and knocked prone. The aboleth can’t use this lair action again until it has used a different one.
- Water in the aboleth’s lair magically becomes a conduit for the creature’s rage. The aboleth can target any number of creatures it can see in such water within 120 feet of it. A target must succeed on a DC 15 Wisdom saving throw or take 13 (4d6) psychic damage. The aboleth can’t use this lair action again until it has used a different one.
Regional Effects
The region containing an aboleth’s lair is warped by the creature’s presence, which creates one or more of the following effects:
- Underground surfaces within 1 mile of the aboleth’s lair are slimy and wet and are difficult terrain.
- Water sources within 1 mile of the lair are supernaturally fouled. Enemies of the aboleth that drink such water vomit it within minutes.
- As an action, the aboleth can create an illusory image of itself within 1 mile of the lair. The copy can appear at any location the aboleth has seen before or in any location a creature charmed by the aboleth can currently see. Once created, the image lasts for as long as the aboleth maintains concentration, as if concentrating on a spell. Although the image is intangible, it looks, sounds, and can move like the aboleth. The aboleth can sense, speak, and use telepathy from the image’s position as if present at that position. If the image takes any damage, it disappears.
If the aboleth dies, the first two effects fade over the course of 3d10 days.
Previous Versions
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