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The Collector Leviathan is the first hostile leviathan-class creature in Subnautica 2, a squid-like predator with procedural tentacle physics, UE5 behavior tree AI, and a Cthulhu-inspired design revealed in Dev Vlog #3.

Leviathan-class organisms in Subnautica 2. Covers the Collector Leviathan (the first hostile leviathan revealed for the game) and the no-weapons philosophy that governs every leviathan encounter.
The Waterslug is a creature in Subnautica 2, revealed through a Time Capsule ARG in July 2024 where developers hid close-up screenshots in the original Subnautica. Features long eyes and a translucent body.
The Cerathecan in Subnautica 2: a passive shelled crustacean that grazes the seafloor, the databank mystery of its genome-less shell, and where to find it.
The Bloom Parasite in Subnautica 2: a virus-infected cephalopod that spreads the Bloom to larger predators, where it appears, and how a resonator pulse deals with it.
The Halfmoon in Subnautica 2: the most versatile edible moon fish, its recipes including Halfmoon Jerky and Threemoon Temaki, its databank entry, and where it schools.
The Harvestmoon in Subnautica 2: the most filling of the three common moon fish, its food value, recipes, and where it schools in the shallows.
The Waxmoon in Subnautica 2: the giant of the moon fish family, its glowing markings, the schools that follow it, and its reaction to a diver's light.
The Jelly Ring in Subnautica 2: a ring-shaped colony organism that feeds on hydrothermal vents, its bioluminescent signaling, and where to find one.
The Twin Sitaray in Subnautica 2: an aggressive electric predator that damages divers, vehicles, and vehicle power, how to read its attack cues, and what its databank explains about its paired biology.
The Geordie in Subnautica 2: a common edible salpapod with a jet channel through its body, its food value and cooking, and its databank biology.
The Hoverthorn in Subnautica 2: a skittish edible fish that rides its own water currents on a charge crystal, the Threat Sense biomod it unlocks, and its recipes.
The Pneuma in Subnautica 2: a kelp-mimicking edible fish that swallows rocks for ballast, its food value, and the ecological story its databank entry tells.
The Bluemoon in Subnautica 2: an edible moon-family fish common near the starting shallows, its food and water values, recipes, and schooling behavior.
The BFJ (Behemoth Finger-Legged Jelly) in Subnautica 2: a huge anchored jelly that grips rock and abandoned seabases, how its databank entry explains its gas bladders and arms, and where to find one.
The Periscopic Clowncrab in Subnautica 2: a passive crab that hides among anemones, its glowing eye stalks, its color variant, and what its databank entry reveals.
The Jetocaris in Subnautica 2: a passive three-legged cave crustacean with jet-propelled legs, parenting behavior, and feeding tongues, plus where to find one.
The Bullethead in Subnautica 2: an aggressive armored squid that rams divers at high speed, how to slip past one with flares or a resonator, and the Camouflage biomod it unlocks.
The Electric Geordie in Subnautica 2: a pack hunter that latches onto the Tadpole and drains its power, how to knock one off, and the two biomods its scan feeds.
The Hycean in Subnautica 2: a huge hydrogen-filled predator that floats above the ocean surface, why it is harmless to divers in the current build, and its databank biology.
The Flash Slug in Subnautica 2: a glowing slug that blinds divers with a burst of light, how to catch one anyway, and the Isotonic Water recipe it feeds.
The Black Hoverthorn in Subnautica 2: the solitary dark variant of the Hoverthorn, where it lives around the Metal Farms, and how its scan and recipes work.
The Surge Jelly in Subnautica 2: a drifting jelly that discharges a defensive electric shock, its role in unlocking the Homing Sense biomod, and how to scan one safely.
The Sandspear in Subnautica 2: an aggressive burrowing ambush predator, how to spot its lure, how resonators repel it, and its role in unlocking the Bioluminescence biomod.

Index of the creatures confirmed in the Subnautica 2 Early Access build: leviathans, fish, crustaceans, jellies, molluscs and salpapods, with the regions they appear in and whether they are hostile.
The Epicurean in Subnautica 2: an aggressive bottom-dweller of the Karakorum runoff pools whose appetite and temper are made worse by Tongue Thief parasitism.