Sea Emperor Leviathan

The Sea Empress Leviathan is the largest of the living Leviathan class fauna found within the crater in Subnautica. She is sapient and telepathic, but unlike most Leviathans, she is not aggressive.

Appearance
She is colossal, having a stocky, entirely armored body and is predominantly pale brown in color, with shades of green. Her tentacles are adorned with bright cyan bioluminescent "bulbs."

Her head is comparatively small, and quite peculiar in shape (see "Trivia" below for more), featuring two striped antennae with glowing green lures atop her snout, two large mandibles on each side of her rather small mouth, and a glowing hollow between these mandibles. She has four binocular eyes, glowing cyan in color.

Her posterior consists of seven long, yet slim tentacles ending with large tentacular clubs, with the largest being in the center, surrounded by the six smaller tentacles.

Unlike the Sea Dragon Leviathan, She doesn't have true graspers; instead, her forelimbs are two massive, paddle-like arms, similar to some paddles used by turtles, primarily used for stabilization while swimming and possibly used for defense against predators.

She also has a hole in the back with an unknown purpose, most likey for creating enzyme 42 or laying eggs.

Behavior
Despite her gargantuan size, the Sea Empress Leviathan's diet consists solely of micro-organisms filtered from the water, much like real-life Baleen whales and Blue whales.

It's suggested that in the past these creatures would have traveled in small herds in the bottom of the trenches (that being the Crater Edge), occasionally coming to the surface to feast on the microorganisms in the shallower water. When the Kharaa Bacterium was released onto the planet, many creatures died, destroying the food source of the species.

The Sea Empress Leviathan is capable of telepathic speech, which she uses to communicate with the player at various locations around the world. Whenever she communicates with the player, the screen becomes distorted in a similar way to when a Warper teleports the player, or a Mesmer hypnotizes the player.

The Sea Empress Leviathan will first contact the player telepathically either sixty minutes after attempting to deactivate the Quarantine Enforcement Platform or twenty minutes after reaching the Disease Research Facility (whichever happens first). She will contact the player again shortly after they have obtained the Blue Tablet, and again upon entering the Lava Lakes. She will continue to interact with the player upon entering the Aquarium, telling them what they need to do in order to hatch the eggs. After the player inserts an Ion Cube into the Incubator Device, the she will speak to the player, and will move to the left side of the Alien Arch, and blow away the sand, uncovering the Arch that the player can use to access the Arch outside of the Quarantine Enforcement Platform.

Upon entering the aquarium, the she will climb up onto a platform to observe and speak to the player, then descend back down. She will also watch the player intently if they are near the Incubator Device or the aquarium Arch, quickly spinning around and coming to a rest on the aquarium's floor.

Story
The captive Sea Empress Leviathan is the last remaining adult of her species and a parent to at least seven eggs. The five eggs which still remain must be hatched at some point in the story. The creature is approximately two-thousand six-hundred years old, having massively surpassed her species' natural lifespan. It is possible that the Aquarium has some form of life support system in place that allowed the captive her to live to such an advanced age, as it was noted that one-thousand six-hundred was already old.

Almost all of her egs died when the Kharaa Bacterium was released as it killed off her food source, leaving only the one captive adult and the eggs she was discovered with. As the only source of Enzyme 42 on Planet 4546B, her and her children are the keys to cure the Kharaa Bacterium.

The Precursors studied the last surviving Sea Empress Leviathan in hopes of finding a cure using her natural production of Enzyme 42. However, due to its weakness, possibly old age or illness, studies conducted showed that she was not a viable source of Enzyme 42 as the enzymes she produced was too unstable and only reverted symptoms temporarily. After the Precursors could not find a way to hatch her eggs naturally, they took three into the dissection room of the Primary Containment Facility and experimented on them, cutting all of them open and removing the fetus from one of the eggs. One other egg was taken to the egg lab, where it was also tested on. Still, they could find no way to cause the hatching process to trigger naturally, and juveniles born outside of the natural conditions could not produce suitable enzymes. They resorted to attaching the eggs to an Incubator Device to keep the eggs alive while they worked on more ways to hatch them. Shortly after this, the Disease Research Facility was destroyed, releasing the Kharaa Bacterium, causing all Arches to the facility to be closed and initiating the planetary quarantine.

At an unspecified time, the She to train Peepers to use the Alien Vents to distribute Enzyme 42 to the surface. Under the her control, Peepers traveled through the Alien Vent, bringing flora seeds to the aquarium, and leaving with small amounts of Enzyme 42 which they distribute at the surface. This system allowed a small amount of life to survive on the planet.

After her eggs are hatched, the captive Sea Empress Leviathan will play with her children and then direct them to the Arch leading just outside the Quarantine Enforcement Platform which they will leave through. The captive will begin dying shortly afterward, as she has used the last of its strength to play with her babies.

Telepathic Contact Dialogue
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Aquarium Telepathic Contact Dialogue
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Data Bank Entries
Sea Emperor Leviathan Research Data= The Sea Emperor's Lifecycle= Specimen Research Data=

Gallery
In Game=

Trivia

 * her dialogue suggests that the species are philosophical, if not religious. She references a concept similar to reincarnation by saying "Perhaps next we meet I will be an ocean current, carrying seeds to new lands... or a creature so small it sees the gaps between the grains of sand".
 * This dialogue also suggests a great understanding of the natural world on the part of the empress, as she understands what an ocean current is and the roles they play in nutrient distribution in the oceans.
 * Early concept art of the Sea Empress Leviathan depicted her with large, clawed graspers on the ends of her arms, resembling those of a Sea Dragon Leviathan. This idea was later replaced by the paddle-like limbs she now have.
 * Despite being depicted significantly smaller than the Sea Dragon Leviathan in concept art, the she was always intended to be the largest creature in Subnautica.
 * The Sea Dragon Leviathan was created as an aggressive reskin of the her.
 * Her dialogue suggests that the Precursors were unable to "hear" her telepathy, as they did not hear her pleas to let her young go free.
 * Certain developmental notes refer to her as the "Emperor Leviathan", and refer to added animations to "bite" and "attack".
 * Various documents also refer to her as the "Grand Leviathan".
 * All Sea Empress sound files exist within the folder "Magistrate", suggesting another developer name. This folder also contains roar sounds, which are higher-pitched versions of Reaper Leviathan roars, which further suggest that she was at one point aggressive.
 * She closely shares many of her features with real-life animals: a head shape slightly similar to that of many hammerhead sharks, and paddle-like arms, resembling those of the green sea turtles.
 * The opening sentence of the databank entry suggests that Sea Empress Leviathans are the largest living species identified in the Subnautica universe.
 * It is possible that she attempted to communicate with Bart Torgal, as he had described seeing visions before his death, presumably the same visions that Ryley Robinson had received during his explorations.
 * It is currently impossible to, and as a result, she does not have a fauna databank entry. Instead, the entry is obtained from a Precursor terminal.
 * It is also impossible to attack her
 * The Sea Empress Leviathan species is the only known complex fauna species on 4546B known to reproduce sexually, in contrast to other known species which reproduce by sexual reproduction as they are simultaneous hermaphrodites, excluding simple fauna species such as the Amoeboid which reproduce via longitudinal fission.