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 14 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.
Multiattack. The aboleth makes three tentacle attacks.
Tentacle. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 12 (2d6 + 5) 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 6 (1d12) acid damage every 10 minutes unless moisture is applied to the skin before 10 minutes have passed.
Tail. Melee Weapon Attack: +9 to hit, reach 10 ft. one target. Hit: 15 (3d6 + 5) bludgeoning damage.
Enslave (3/Day). The aboleth targets one creature it can see within 30 feet of it. The target must succeed on a DC 14 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, 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 10 (3d6) psychic damage, and the aboleth regains hit points equal to the damage the creature takes.
Description
Visil'Taphenos Meadswimmer is a renegade aboleth savant originally from Llurth Dreir, and sole remaining High Old One of Dumathoin, living in Ultoksamrin.
Born more than a thousand years before in Llurth Dreir, Visil descended from a line of aboleths specializing in dwarven lore. Very early on, it displayed the exceptional mental skills needed to become an aboleth savant. It weighs 6500 pounds. The immediate area surrounding it is filled by magic water/jelly. It also transmutes the air before and behind it as it moves.
As a savant, it became interested in the idea of combining complex aboleth symbols with dwarven rune lore. It came through The Veil after the Mind-Flayer invasion and the Vhaeraunites had largely won the war, despite the Urdunnir losses. Thus it sought out and consumed one of the few remaining dwarven runemasters, a High Old One of Dumathoin [Taphenos Meadswimmer], carer of the Vault of Cloaked Midnight (who never left his post). It absorbed the knowledge, but also acquired many aspects of the victims' personality into itself, becoming Visil'Taphenos. Understanding that it couldn't go back to its home, it chose to live as an exile in Ultoksamrin, and was accepted by the Drow. There, it became one of the most pre-eminent sages of the Underdark.
Visil'Taphenos exchanges its knowledge for dwarven lore or artefacts, with individuals of all races.
Visil'Taphenos has the ability to cast Cleric spells up to Level 5, and tattoo magical urdunnir/aboleth runes that confer special abilities.
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 60 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 90 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 14 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 90 feet of it. A target must succeed on a DC 14 Wisdom saving throw or take 7 (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:
- 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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