Nemateuthis (5e Creature)
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Gargantuan monstrosity, chaotic neutral
Saving Throws Wis +2
Amphibious. The nemateuthis can breathe air and water.
Colonial Kraken. The nemateuthis has a colony of mutualistic roundworms: 2 rippers and 2d4 + 2 slurpers. While it has at least one worm, the nemateuthis has advantage on saving throws against being deafened, stunned, and knocked unconscious.
Wormbrain Host. The nemateuthis can't be compelled to act in a manner contrary to its nature.
Wakeful. While the nemateuthis sleeps, at least one of its roundworms is awake.
Multiattack. The nemateuthis makes as many slurp attacks as it has slurper worms; it may replace a number of slurp attacks equal to the number of ripper worms it has with rip attacks. It can make as many fling actions as it is able.
Slurp. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 5 (1d8 + 1) bludgeoning damage plus 5 (1d8 + 1) acid damage, and the target is grappled (escape DC 15). Until this grapple ends, the target is restrained. The nemateuthis can grapple as many creatures as it has slurper worms.
Rip. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 16 (3d8 + 3) piercing damage.
Fling. One Large or smaller object held or creature grappled by the nemateuthis is thrown up to 60 feet in a random direction and knocked prone. If a thrown target strikes a solid surface, the target takes 2 (1d4) bludgeoning damage for every 10 feet it was thrown. If the target is thrown at another creature, that creature must succeed on a DC 16 Dexterity saving throw or take the same damage and be knocked prone.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d10) piercing damage.
The organism usually referred to as a nemateuthis is, in fact, a colossal symbiotic superorganism. Composed of a weak, vaguely birdlike host body (the "true" nemateuthis) which contains a colony of parasitic roundworms grown to massive sizes; these, in turn, contain thousands upon thousands of microscopic brain-flukes which coordinate movement and act as the brain for organism as a whole. Although amphibious, nemateuthis prefer to live in aquatic environments where they can pull large prey (and vessels) under to feed. With literally dozens of mouths to feed, incredible strength, and no real weak points, the nemateuthis is an apex predator in almost any environment.
Blood Feud. Although it finds it fairly easy to replace missing worms, a nemateuthis can hold a permanent grudge against those who injure their youngest, never forgetting an individual chemical scent. In battle, the loss of a single slurper worm will drive the others into a frenzy as they attempt to tear the hostile creature to shreds.