Chuuk'calc'un

Hailing originally from the Far Realms, this aboleth has grown in both size and power as it has aged. The depths of kukiri chasm have been a fantastic lair for this aboleth; giving him the privacy he so desired to do his own thing. The constant telepathy of aboleth society simply galled the private creature, who struck out on his own despite the dangers to a young creature such as himself.

Despite the odds, the alien creature found itself a lair deep within the depths of the Kukiri Chasm's system of lakes and underground rivers. It avoids Ancient Anaemonae's end of the chasm; the aboleth does not trust the dracolich even a little bit, and suspects Ogg'magogh of badly wanting to vivisection it. He is right, of course, and has therefore it has been very paranoid and protective of its lair.

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SRD, with a litle fiddlin'

Chuuck'calc'un CR: 20

Tiny to Gargantuan aberration, lawful evil

Armor Class: 25 (natural armor)

Hit Points: 325 (36d10+36)

Speed: 40 ft , fly: 80 ft , burrow: 25 ft , swim: 40 ft , climb: 25 ft , can hover

STR

25 +7

DEX

9 -1

CON

25 +7

INT

18 +4

WIS

18 +4

CHA

20 +5

Saving Throws: CON +10, INT +12, WIS +10

Skills: History +15, Perception +12

Damage Resistances: Magic, cold, acid; bludgeoning, slashing, and piercing from non-magical weapons

Damage Immunities: Psychic, poison

Condition Immunities: stunned, frightened, charmed

Senses: darkvision 120 ft, passive perception 20

Languages: Deep Speech, Telepathy 120 ft

Challenge Rating: 20

Proficiency Bonus: +4

At will: Phantasmal force

Amphibious. The aboleth can breathe air and water.
Mucous Cloud. While udnerwater, 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 18 Constitution saving throw. On a failure, the creature is diseased for 1d8 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.

Actions

Multiattack. The aboleth makes four tentacle attacks.
Tentacle. Melee Weapon Attack: +12 to hit, reach 15 ft., up to four targets. 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: +12 to hit, reach 10 ft., one target. Hit: 20 (4d6 + 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 18 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.

Legendary Actions

The aboleth can take 3 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 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 (4d6+5) psychic damage, and the aboleth regains hit points equal to the damage the creature takes.

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:

• 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.

Chuck'calc'un is an ancient aboleth that found its way to one of the lakes that have formed at the bottom of Kukiri Chasm. He is happy to hang out there, for now, unknown and left alone to do his own psychic experimentation. He is a completely alien intelligence, although it will make telepathic contact with wanderers who find themselves close to his lair, if only to lure them closer in order to consume them.