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1-The Tongue Thief is a small parasite and nuisance creature in Subnautica 2. It poses no direct lethal threat to the player, but it can interfere with diving by knocking a held tool out of your hands. In keeping with the game's no-weapons philosophy, it is handled through avoidance and recovery rather than combat.
1+The Tongue Thief is a small passive crustacean parasite in Subnautica 2 that lives in the runoff pools of the Karakorum Metal Farms. Its tentative species name is Ostrakonskelos glossaklept, literally the hard-legged tongue thief, a reference to its parasitic lifestyle. The Tongue Thief is not a player-facing threat in the usual sense; it does not damage divers and is classed as passive. Its role in the ecosystem is to parasitise the Epicurean, a larger crustacean it manipulates from inside the host's mouth.
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3-Overview
3+Appearance and Habitat
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5-The Tongue Thief is classed as a parasite rather than a predator. Its defining trait in the current Early Access build is the way it interacts with the player's equipped gear: rather than dealing meaningful damage, it targets whatever tool the player is holding and can dislodge it. This makes the creature more of an inconvenience than a danger, but a dislodged tool can be a problem in the middle of another encounter or while harvesting resources.
5+Tongue thieves closely resemble Earth crabs and other members of Pancrustacea, with a segmented crab-like body and two trailing cerci that evolved from rear legs. Individuals are colored a faint light yellow, blending in with the runoff pools they inhabit. They are most often encountered in swarms around runoff pools within the Karakorum Metal Farms region, which is also where the Epicurean host species lives.
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7-Behavior
7+Parasitic Behavior
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9-The Tongue Thief appears to home in on a player who is actively using or holding a tool. When it makes contact, it can knock that tool loose, forcing the player to recover it before continuing. Its exact spawn locations, numbers, and the precise trigger conditions for the tool-knock behavior are not fully documented in the current build, so treat any specifics beyond the basic effect as unconfirmed.
9+Individual tongue thieves swim deliberately toward Epicureans to be swallowed. After ingestion, a tongue thief evades the host's digestion by latching onto the Epicurean's tongue. From that anchored position the parasite secretes a numbing agent that blocks the host's nerves signalling satiety to the brain. The Epicurean never registers as full, which drives it to feed constantly and become noticeably more aggressive. The parasite gets a stable supply of nutrition from the host's increased intake, and in this sense the relationship is described in the in-game scan entry as semi-cooperative even though it remains parasitic.
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11-How to Deal With It
11+Tongue thieves reproduce in place inside their host. Eggs or spermatophores are anchored in the host's mouth and wait until a thief of the opposite sex arrives. Newly-hatched manca pass out through the Epicurean's digestive tract and disperse to find their own hosts.
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13-Holster or stow your tool when you see one approaching, so there is nothing in your hands for it to dislodge.If it does knock a tool loose, recover the dropped item before resuming your task.Avoid lingering in its vicinity while mid-harvest, since losing a tool during resource collection wastes time.Because it is a nuisance rather than a lethal threat, there is no need to try to fight it; moving away resolves the encounter.
13+Removing a Tongue Thief
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15+A tongue thief can remain attached to its host indefinitely, but it can be expelled by the player using the Sonic Resonator. The Survival Multitool does not work for this purpose; only the Sonic Resonator's pulse can dislodge the parasite. Expelling the tongue thief reduces the host Epicurean's hunger-driven aggression.
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17+Real-World Inspiration
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19+The Tongue Thief is a direct nod to Cymothoa exigua, the Earth isopod commonly called the tongue-eating louse, which similarly parasitises fish by living in the mouth and even replacing the host's tongue. The Subnautica 2 design borrows the parasite's location and feeding mechanism, then adds the satiety-blocking chemistry and the gameplay loop around removing it.
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21+In-Game Notes
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23+The Tongue Thief is scannable for the Databank, which records its species name, body plan, parasitic hijack, and the cultural-function speculation found in the in-game entry. Players who want to keep Epicureans from becoming hyper-aggressive in a given area should periodically clear any host carrying a tongue thief; the immediate decrease in feeding pressure is the main observable effect of the cleanup.