Amphibious. The aboleth can breathe air and water.
Mucous Cloud. While underwater, the aboleth is surrounded by transformative mucus. A creature that touches the aboleth or that hits it with a melee attack while within 5 feet of it must make a DC 19 Constitution saving throw. On a failure, the creature is diseased for 1d4 hours. The diseased creature can breathe only underwater.
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.
Aura of Obedience. When a creature comes within 30 feet of Sovereign for the first time, they must succeed a DC19 intelligence saving throw or be stunned until the start of it's next turn. When within 30 feet of Sovereign, saves against being charmed or to the end the charmed condition are made with disadvantage.
Total domination. If a creature is charmed by sovereign, the charmed status can not eb removed by spell effects of 4th level or lower.
Legendary resistance (3/day or 4/day in lair). If the Aboleth Sovereign supreme were to fail a saving throw, it can choose to succeed instead. It can do this once before requiring a long rest to restore this feature.
Innate Spellcasting. The Aboleth Sovereign Supremes' spellcasting ability modifier is charisma (Spell save DC 19). The Aboleth can innately cast the following spells, requiring no material components.
At will: Major image
3/day each: Phantasmal force, Hypnotic pattern
1/day each: Telekinesis, programmed illusion, Synaptic static
Multiattack. The aboleth makes 4 tentacle attacks. It can replace any tentacle attack with psychic blast, consume memory or enslave. If it uses enslave, it cannot use it again next turn.
Tentacle. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 12 (4d8 + 7) bludgeoning damage. If the target is a creature, it must succeed on a DC 14 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 13 (2d12) acid damage every 10 minutes unless moisture is applied to the skin before 10 minutes have passed.
Tail. Melee Weapon Attack: +13 to hit, reach 10 ft. one target. Hit: 15 (3d8 + 7) bludgeoning damage. If the target is large or smaller, the Aboleth sovereign supreme can choose to push the target 10 feet away.
Consume memory. The aboleth chooses a creature within 60 feet. It must make a DC19 intelligence saving throw or take 5d6 psychic damage and the aboleth gains the target's memories. On a succsesful save, the target only takes half damage.
Psychic blast. Ranged Weapon Attack: +11 to hit, reach 60 ft. one target. Hit: 14 (4d6) psychic damage. A target hit by this effect can't take reactions until the start of their next turn. If the target is reduced to 0 hit points by this attack, the Aboleth Sovereign Supreme regains a number of hit points equal to the damage dealt.
Enslave. The aboleth targets one creature it can see within 30 feet of it. The target must succeed on a DC 19 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.
Whenever the charmed target takes damage, the target can repeat the saving throw. On a success, the effect ends. No more than once every 24 hours, the target can also repeat the saving throw when it is at least 1 mile away from the aboleth.
The aboleth can take 3 legendary actions (or 4 if in lair,) 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 20 (6d6) psychic damage, and the aboleth regains hit points equal to the damage the creature takes.
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 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 60 feet of it. While maintaining concentration on this effect, the aboleth can’t take other lair actions.
- Pools of water within 150 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 19 Strength saving throw or be pulled up to 20 feet into the water and restrained. 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 150 feet of it. A target must succeed on a DC 19 Wisdom saving throw or take 14 (2d6) 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.
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