Nudibranches and other molluscs....

Cleon

Legend
Dangit, I haven't checked the Description yet, I was just looking at the mechanical bits.

Let's see, it's got:

A 15-20 ft long soft-bodied, slug-like creature, with vivid blue and white stripes and a silver-grey belly, has six appendages with several 'fingers', or cerata, each. It lives in coastal waters. This huge nudibranch is c arnivorous; it enjoys the taste of flesh and will eat it voraciously with its rubbery mouth.​

I can see a few issues with that. For example, blue glaucus has jaws and a rasping tongue (a radula). It also isn't a coastal creature.

How about…

Description

A giant blue glaucus is an enormous nudibranch, a soft-bodied marine animal commonly known as a sea slug. Its elongated body is about three times longer than a human is tall, with a vivid blue and white striped back and a silver-grey belly. A blue glaucus has six pairs of appendages, three on each side of its streamlined body, which split into numerous 'fingers' called cerata; these paired appendages grow bigger towards the animal's head.
 While most nudibranches crawl on the sea floor, a blue glaucus is a pelagic species that lives on the ocean's surface. Buoyed by swallowed air, it floats with the currents, swimming towards anything that smells tasty. Like all nudibranches, a giant blue glaucus is carnivorous. Its favorite food is giant jellyfish but it will attack any creature it can catch, using strong mouthparts and a serrated tongue to voraciously tear pieces from its prey.

Stolen Stings. A blue glaucus has the curious ability to eat a venomous jellyfish without being stung by its tentacles and then transferring its meal's stinging cells to the tips of its cerata. These sting-tipped cerata are the giant nudibranch's main defence. It swims too slowly to escape most predators and while its soft body can survive considerable damage it is rather easy to injure.
 

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Cleon

Legend
Heck, I might as well put the above together with the statblock you just posted for an Enworld version of the Nudi…
 

Cleon

Legend
Nudibranch, Giant (Blue Glaucus)
Huge beast, unaligned
Armor Class 10 (natural armor)
Hit Points 114 (12d12 + 36)
Speed 20 ft., swim 20 ft.

STR​
DEX​
CON​
INT​
WIS​
CHA​
18 (+4)​
5 (–3)​
16 (+3)​
1 (–5)​
12 (+1)​
5 (–3)​

Senses Darkvision 60 ft., passive Perception 11
Languages
Challenge 3 (450 XP) Proficiency Bonus +2

Keen Smell. The giant nudibranch has advantage on Wisdom (Perception) checks that rely on smell.

Venomous Defense. Any creature within 15 ft. of the blue glaucus must make a DC 13 Dexterity saving throw on its turn, on a failure the blue glaucus can make a stinging cerata attack against the creature as a free action. In addition, creatures attacking the blue glaucus in melee (unless using a reach weapon) must succeed on a DC 13 Dexterity saving throw or be automatically hit by a stinging cerata attack.

Water Breathing. The blue glaucus can breathe only underwater.

Waterbound. A giant nudibranch can only use its ground speed when submerged in water.

Actions

Bite.Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage.

Stinging Cerata. Melee Weapon Attack: +6 to hit, reach 15 ft., one target. Hit: the target must make a DC 13 Constitution saving throw, on a failed save they take 13 (3d6+3) poison damage and are poisoned for 1 hour, on a successful one they take half as much damage and are not poisoned.


Description

A giant blue glaucus is an enormous nudibranch, a soft-bodied marine animal commonly known as a sea slug. Its elongated body is about three times longer than a human is tall, with a vivid blue and white striped back and a silver-grey belly. A blue glaucus has six pairs of appendages, three on each side of its streamlined body, which split into numerous 'fingers' called cerata; these paired appendages grow bigger towards the animal's head.
 While most nudibranches crawl on the sea floor, a blue glaucus is a pelagic species that lives on the ocean's surface. Buoyed by swallowed air, it floats with the currents, swimming towards anything that smells tasty. Like all nudibranches, a giant blue glaucus is carnivorous. Its favorite food is giant jellyfish but it will attack any creature it can catch, using strong mouthparts and a serrated tongue to voraciously tear pieces from its prey.

Stolen Stings. A blue glaucus has the curious ability to eat a venomous jellyfish without being stung by its tentacles and then transferring its meal's stinging cells to the tips of its cerata. These sting-tipped cerata are the giant nudibranch's main defence. It swims too slowly to escape most predators and while its soft body can survive considerable damage it is rather easy to injure.

(Original monster designed by Casimir Liber and Cleon on the Creature Catalog Monster Homebrews forum)
 
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