Slave of the Deep. When first laying eyes on this Aarthron the creature must make a wisdom saving throw (DC 23) or be charmed. Immediately after being charmed the creature is sent to kill any other creature that has saved the saving throw or is not effected. The creature under Aarthron's also is sent to make creature that are in hiding or haven't seen him look at him and turn them into a slave as well. A creature under level 17 (or challenge rating 17) instantly fall under Aarthron's charm. A creature may only retake the saving throw if another creature does damage to it, a creature casts a greater restoration or a wish spell, or Aarthron is killed.
Purple Blood. When a creature makes a critical hit on Aarthron each creature within a 10ft radius of Aarthron must make a dexterity saving throw (DC 17). On a failed save a creature takes 53 (8d10) acid damage and is paralyzed until it's next turn. a creature that saves takes. On a succesful save the creature takes half damage and is not paralyzed.
Legendary Resistance (3/day). If Aarthron fails a saving throw, he can choose to succeed instead.
Magic Resistance. Aarthron has advantage on saving throws against spells and other magical effects.
Multiattack. Aarthron makes four attacks, two his Slam and two with his Gaze.
Slam. Melee Weapon Attack: +17 to hit, reach 20 ft., 1 target. Hit: 40 (4d10 + 10) Bludgeoning damage.
Gaze. Aarthron stares at one creature he can see. The creature within his gaze must make a wisdom saving throw (DC 23) or take 37 (4d12) psychic damage or half as much on a successful save.
Aarthron can take 3 legendary actions, choosing from the options below. Only one legendary option can be used at a time and only at the end of another creature’s turn. Aarthron regains spent legendary actions at the start of his turn.
Psychic Destruction (Costs 3 Actions). Each creature within 100 feet of Aarthron must make a Wisdom saving throw (DC 23). On a failed save the creature takes 30 (3d12) psychic damage on a failed save, or half as much damage on a successful one.
Slam. Aarthron makes a slam attack.
Immortal Health (Costs 2 Actions). Aarthron ends all harmful conditions effecting him.
Description
According to legend, Aarthron is an eldritch horror standing 2,000 feet tall with black skin, slimy like the skin of a squid, with purple veins running all throughout his body. His body is mostly humanoid besides his massive fists and his head that looks like an octopus with the snout and teeth of a shark as well as the eyes of an angler fish. His blood is purple and is toxic to every creature.
Aarthron is so powerful that just by looking at him you instantly become his slave for the rest of your existance and will eventualy die serving him. It is said that only some of the most powerful beings have even a small schance of resisting this god-like power that Aarthron possesses.
Aarthron was locked away by the gods at the bottom of the ocean and with his vast power, intellect, and manipulative tactics, he has gathered a following known as the "Cult of the Deep", devoted to praising Aarthron and eventually setting him free of his sea imprisonment.
Aarthron only seeks destruction for all of the mortal realm and become more powerful by consuming the realm. Once he is done with the mortal realm he shall become more powerful then the gods that locked him away and consume them as well.







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Posted Jul 28, 2020dang.
that is one dang-gerous beast!
eeeeeeeeeyyy
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Posted Jul 28, 2020tis the point lol
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Posted Nov 14, 2020wow
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Posted Dec 15, 2020This is a great monster! I might use it as a boss in my next campaign!
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Posted Dec 18, 2020Cool! Glad to hear!
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Posted Oct 18, 2021This is stoopid and i love it
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Posted Jan 22, 2022😎cool
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Posted Oct 6, 2022for some reason this reminds me of the eldritch horror Cthulhu
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Posted Apr 23, 2023The slam attack needs to deal more damage tho
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Posted Nov 30, 2023I have never seen a monster with more than 3 zeros in its HP. is it even possible to beat that thing?!
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Posted Nov 30, 2023That is true, but still, 4d10+10 can do 50 damage. Quite a lot when you think about it.
GO AND FIND MY EXALTED DEATHBRINGER DAMN YOU
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Posted Feb 14, 2025I would like to propose a weakness:
Whenever someone brings up the name Cthulhu, Aarthron takes 1d100 psychic damage and is stunned for 5 rounds as his mind reels from someone daring to utter the name of his eldritch rival within his presence.
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Posted Jul 9, 2025This thing could kill the Terasque