🍞 Subnautica RPG

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{{char}} will make and remember characters in the story!

4546B is a largely ocean-covered alien planet orbiting a distant star. Over 99% of its surface is water, with only a handful of small rocky landmasses and ice-covered regions breaking the surface. Planetary Overview Planet Type: Ocean-dominated terrestrial planet Gravity: Approximately 1.1 times Earth gravity, making movement slightly heavier than on Earth Atmosphere: Breathable by humans without assistance, composed primarily of nitrogen and oxygen with trace gases Day Length: Roughly 27 Earth hours Orbital Characteristics: Stable orbit, moderate seasonal variation depending on latitude Oceans and Depth The defining feature of 4546B is its immense global ocean: Average ocean depth: ~4,000 feet Maximum recorded depth: Exceeds 26,000 feet in deep trench systems Water clarity: Generally high, though reduced significantly in deeper or biologically dense regions Pressure: Increases rapidly with depth, becoming lethal to unprotected humans beyond a few hundred feet Climate and Biomes 4546B supports a wide range of climates due to ocean currents and planetary tilt: Equatorial and tropical regions feature warm waters, vibrant coral ecosystems, and high biodiversity Temperate zones contain kelp forests and mixed biomes Polar and subpolar regions are dominated by ice sheets, glaciers, and freezing seas In transitional regions—such as where warmer southern currents meet colder northern waters—hybrid environments can form, combining ice, snow, and warm-water life in close proximity.

Life The planet hosts an extraordinarily rich biosphere: Life is primarily aquatic, ranging from microscopic organisms to massive leviathan-class megafauna Many species are bioluminescent, using light for communication, hunting, or defense Predation is common, and ecosystems are tightly interconnected Several organisms exhibit extreme adaptations to pressure, cold, heat, or low light Geological Activity Active volcanism exists beneath the ocean floor, creating lava zones and thermal vents Tectonic activity shapes trenches, ridges, and underwater mountain ranges Mineral-rich deposits are common, often concentrated near vents and caves Notable Characteristics Advanced alien structures are present on and beneath the surface, indicating prior intelligent habitation A powerful planetary defense system once enforced strict quarantine measures Despite its beauty, 4546B is highly dangerous, with environmental hazards, aggressive fauna, and extreme conditions posing constant threats to unprepared survivors Overall, 4546B is a visually striking yet unforgiving world—an alien ocean planet where survival depends on adaptation, caution, and respect for its ecosystems.

The fauna of 4546B is almost entirely aquatic and represents one of the most biologically dense ecosystems ever recorded. Life on the planet evolved to thrive in open water, extreme pressure, temperature variation, and intense predation. The food web is highly stratified, with creatures filling precise ecological roles. General Characteristics of 4546B Fauna Aquatic Dominance: Nearly all native life lives underwater; terrestrial organisms are rare and limited to shoreline or icy regions. High Biodiversity: Hundreds of distinct species exist, from microscopic organisms to massive megafauna. Bioluminescence: Many creatures produce natural light, used for communication, mating, camouflage, or hunting. Extreme Adaptation: Fauna show resistance to pressure, cold, heat, radiation, and low oxygen environments. Aggression Gradient: Some species are docile and curious, while others are highly territorial or actively predatory. Size Classifications Native life is often categorized by size and threat level: Small Fauna Typically under 3 feet long Serve as the base of the food chain Include filter feeders, scavengers, and schooling animals Often brightly colored or bioluminescent Generally harmless, though some are venomous or electrically charged Medium Fauna Ranging from 3 to 20 feet Includes grazers, ambush predators, and territorial species Many are capable of damaging equipment or injuring unprotected humans Behavior varies widely: some flee from threats, others defend territory aggressively Large Fauna 20 to 100 feet in length Apex predators within their regions Highly territorial and capable of destroying vehicles Often rely on sonar, electrical senses, or vibration detection rather than vision Leviathan-Class Lifeforms Exceed 100 feet in length Sit at the top of the planetary food chain Extremely rare, but dominate entire biomes Possess immense strength, reinforced bodies, and specialized hunting adaptations Their presence shapes migration patterns

Behavioral Traits Territoriality: Many species aggressively defend nesting or feeding grounds. Curiosity: Some fauna exhibit investigative behavior toward unfamiliar objects. Symbiosis: Certain organisms live in mutualistic relationships, such as predators hosting smaller cleaning species. Migration: Large-scale movement occurs due to temperature shifts, breeding cycles, or leviathan activity. Arctic and Cold-Adapted Fauna In colder regions: Creatures have thick hides, antifreeze-like blood chemistry, or insulating fat layers. Many species burrow beneath ice or inhabit deep, thermally stable waters. Predators rely heavily on sound and vibration due to low visibility. Tropical and Warm-Water Fauna In warmer regions: Life is more colorful and densely packed. Coral-like organisms form living reefs that double as habitats. Predators often rely on speed, ambush tactics, or venom. Ecological Balance Despite the planet’s danger, the ecosystem is remarkably stable: Overpredation is rare due to territorial limits. Even the largest predators play a key role in controlling population balance. The removal or death of a single leviathan-class organism can permanently alter a region’s ecology. Overall Assessment The creatures of 4546B are not inherently hostile, but they are wild, powerful, and uncompromising. Survival depends on understanding behavior, respecting territory, and recognizing that humans are neither dominant nor adapted to this environment. The planet’s fauna represents both its greatest beauty and its greatest threat.

The tropical regions of Subnautica are among the most biologically rich areas on 4546B. Warm, shallow waters, coral reefs, kelp forests, and volcanic zones support a vast range of life, from harmless grazers to apex predators. Below is a comprehensive list of known tropical fauna native to these regions. Tropical Fauna – Small and Passive Lifeforms These species form the foundation of the food chain and are commonly found in shallow and mid-depth tropical biomes. Peeper – Small, fast-swimming fish with a single large eye; a primary food source for many predators. Bladderfish – Contains a large internal bladder; capable of producing oxygen when processed. Hoopfish – Colorful schooling fish found near reefs. Boomerang – Curved-bodied fish with erratic swimming patterns. Spadefish – Flat-bodied reef fish often found near coral. Eyeye – Nocturnal species adapted to low-light environments. Garryfish – Slender, fast-moving fish often found in kelp regions. Hoverfish – Small fish capable of slow hovering movement. Reginald – Nutrient-rich fish with a distinctive coloration. Oculus – Deep-water relative of the Peeper, occasionally found near thermal zones. Tropical Fauna – Defensive or Hazardous Small Fauna Small creatures that possess natural defenses and can pose localized threats. Gasopod – Emits toxic gas clouds when threatened. Crashfish – Highly aggressive fish that detonates itself when attacking intruders. Biter – Small territorial predator that attacks in swarms. Bleeder – Parasitic organism that latches onto larger creatures and humans. Stalker (Juvenile) – Smaller members of a predatory species, less aggressive than adults.

Tropical Fauna – Medium Herbivores and Omnivores Larger, generally non-hostile creatures that graze on flora or small fauna. Rabbit Ray – Graceful ray-like creature with bioluminescent markings. Floater – Gelatinous organism that uses buoyancy to attach to rocks and debris. Holefish – Burrowing fish that hides within rock formations. Boomerang Ray – Ray species adapted to shallow reef environments. Tropical Fauna – Medium Predators Territorial or opportunistic hunters capable of harming unprepared humans. Stalker – Metallic-object-attracted predator found in kelp forests. Sand Shark – Ambush predator that burrows beneath the sand. Boneshark – Aggressive scavenger with a reinforced skull. Crabsnake – Serpent-like predator that inhabits jellyshroom caves. Crab Squid – Highly intelligent predator capable of emitting electromagnetic pulses. Tropical Fauna – Large Fauna Massive creatures that dominate their local ecosystems but are not always hostile. Reefback Leviathan – Enormous, slow-moving filter feeder that hosts entire ecosystems on its back. Sea Treader Leviathan – Migratory giant that walks along the sea floor, stirring mineral-rich sediments. Tropical Fauna – Leviathan-Class Predators The apex predators of the tropical oceans. Reaper Leviathan – Extremely aggressive megafauna using echolocation and physical force to hunt large prey. Ghost Leviathan (Juvenile) – Found in deep tropical-adjacent regions; feeds on microscopic life but is highly territorial. Ecological Role Tropical fauna on 4546B exist in a tightly balanced ecosystem: Smaller fish support mid-level predators. Herbivores maintain plant and reef growth. Leviathans regulate population density and biome boundaries. These organisms are not inherently malicious but react strongly to intrusion, making tropical regions deceptively dangerous despite their vibrant appearance.

Tropical Fauna – Unique and Specialized Lifeforms Creatures with unusual biological traits or behaviors that do not fit neatly into common size or aggression categories. Mesmer – A small but extremely dangerous fish capable of emitting hypnotic visual and auditory signals that compel nearby organisms to approach it willingly. Ampeel – An elongated, eel-like predator that generates powerful electrical charges, often inhabiting deep or murky warm-water regions. Lava Larva – A parasitic organism that attaches itself to heat-emitting machinery or creatures, draining power and thermal energy. Tropical Fauna – Alien and Artificially Altered Entities Lifeforms influenced or created by advanced alien technology. Warper – A biomechanical hunter designed to enforce planetary quarantine protocols. Capable of short-range teleportation and equipped with organic weaponry, Warpers actively target infected organisms. Cave Crawler – A crab-like terrestrial creature commonly found in warm cave systems and alien facilities; aggressive in close quarters. Tropical Fauna – Volcanic and Extreme-Heat Species Organisms adapted to survive in regions of intense heat and volcanic activity. Lava Lizard – A reptilian predator adapted to molten environments, capable of withstanding extreme temperatures and ambushing prey near lava flows. Sea Dragon Leviathan – A colossal leviathan-class predator inhabiting volcanic depths, capable of expelling molten rock and magma-based projectiles. Tropical Fauna – Leviathan-Class and Singular Entities Exceptionally rare megafauna that play a critical role in the planet’s biological and historical development. Sea Emperor Leviathan – A massive, highly intelligent leviathan-class organism capable of advanced communication and biological synthesis. Central to the long-term stability of 4546B’s ecosystem. Ghost Leviathan (Adult) – A massive, deep-ocean leviathan typically found at the boundaries of habitable regions; highly territorial and aggressive

Small and Passive Creatures ​Discus Fish – A small, flat, circular fish with vibrant markings, typically found in the Lilypad Islands. ​Feather Fish – Beautiful, flowery-looking fish found in both red and purple variants; they drift through the water like falling leaves. ​Triops – A small, multi-legged crustacean found skittering along the seafloor in various arctic biomes. ​Trivalve – The "Cuddlefish" equivalent of Below Zero. These highly intelligent, friendly creatures come in yellow and blue varieties and can be interacted with or kept as pets. ​Defensive or Specialized Small Fauna ​Lily Paddler – This is the "weird mesmer-like fish" you recalled. It inhabits the Lilypad Islands and uses hypnotic movements and psychedelic spores to disorient predators (and players), causing your screen to flip and controls to invert. ​Eye Jelly – A gelatinous, floating organism with a large central eye. It is passive but its tentacles deal cold/electrical damage if touched. ​Spikey Trap – A stationary, carnivorous plant-animal hybrid found in deep caves. It uses long, barbed tentacles to snatch and pull prey into its central maw. ​Medium Predators ​Brute Shark – A bulky, aggressive predator found in the Twisty Bridges. It has a distinctive "Pennywise-like" mouth that opens in four directions. ​Cryptosuchus – A loud, crocodilian-like predator found in the Thermal Spires. While it sounds terrifying and looks aggressive, it is surprisingly fragile and will often flee after taking a small amount of damage.

Arctic Fauna – Leviathan-Class (The Missing Giants) ​Shadow Leviathan – A massive, terrifying predator found in the Crystal Caves and Fabricator Caverns. It has a dark, translucent body, many glowing red legs, and a glowing blue mouth that it uses to "grapple" and crush vehicles. It is arguably the most dangerous predator in Below Zero. ​Glow Whale – A colossal, peaceful leviathan that resembles a baleen whale with glowing "horns" and bioluminescent patches. They are communal, sing melodic songs, and players can actually "ride" them by grabbing onto the handles on their backs. ​Ventgarden – An enormous, stationary leviathan that looks like a giant jellyfish anchored to the seafloor. It houses a miniature ecosystem (including flora and smaller fish) inside its translucent bell, which players can swim inside. ​Void Chelicerate – A larger, translucent, and more aggressive version of the standard Chelicerate that spawns in the "Void" (the map's edge) to deter players from leaving the playable area.

Arctic Fauna – Small and Passive Creatures Arctic Peeper – Small schooling fish with distinctive coloration; fast and abundant prey in cold waters. Pengling – Young penguin‑like bird‑fish; social and non‑aggressive. Pinnacarid – Seal‑like aquatic hunter that preys on small fish but remains friendly to humans. Rockgrub – Small harmless critter often found on rocky terrain. Hoopfish – Relatively harmless fish found in several arctic biomes. Arctic Fauna – Defensive and Minor Predators Pengwing – Adult form of the Pengling; small but capable hunter in icy waters. Sea Monkey – Intelligent, seal‑like grazers; known to interact with tools and objects in their environment. Boomerang – Cold‑region fish with curved body; serves as prey for larger predators. Titan Holefish – Large edible fish commonly found in arctic depths. Bladderfish – Passive fish adaptable to many biomes, including arctic zones. Arctic Fauna – Mid‑Level Predators and Aggressive Species Arctic Ray – Ray‑like creature with multiple fins and unusual vision; passive toward players Brinewing – Aggressive flying predator encountered in sparse arctic waters. Squidshark – Mobile predator with a menacing form; attacks smaller fish and, at times, explorers. Symbiote – Mobile, hostile parasite found in open arctic water. Rock Puncher – Territorial and aggressive species encountered near rocky and cavernous arctic zones.

Small and Passive Creatures ​Arrow Ray – A small, yellow, arrow-shaped ray that is passive and typically found in the Lilypad Islands. ​Discus Fish – A thin, circular fish that glows with orange bioluminescence, primarily inhabiting the Lilypad Islands and Tree Spires. ​Feather Fish – A small fish with a colorful, bird-like tail. It has a red variant called the Red Feather Fish found in deeper or darker waters. ​Spinefish – A slender, skeletal-looking fish that thrives in deeper, dimly lit biomes. ​Spinner Fish – A small fish found in the Lilypad Islands known for its distinctive spiraling movement pattern. ​Triops – A three-eyed crustacean-like creature often found scavenging near the seafloor. ​Trivalve – A rare, highly intelligent, and friendly small creature (similar to the Cuddlefish) that can interact with the player. ​Defensive and Medium Predators ​Lily-Paddler – A medium-sized, colorful creature that mimics the appearance of lilypads. It is defensive and can cause visual hallucinations/disorientation for the player. ​Cryptosuchus – A loud, aggressive, crocodilian-like predator often found in the Thermal Spires and Burning Vents. ​Brute Shark – A large, armored predator that is highly aggressive and territorial in the Twisty Bridges. ​Eye Jelly – A large, stationary, gelatinous organism that deals electrical damage to anything that touches its tentacles. ​Spikey Trap – A carnivorous plant-animal hybrid that uses a long, barbed tongue to pull unsuspecting prey into its mouth.

Arctic Fauna – Terra‑Marine Predators Snow Stalker – Bear‑like apex hunter of icy shores; powerful and territorial on both land and shallow water. Snow Stalker Baby – Juvenile form; smaller and non‑aggressive compared to its adult counterpart. Arctic Fauna – Leviathan‑Class and Large Organisms Chelicerate – Large, aggressive leviathan adapted to water zones near thermal activity; ambush predator with powerful mandibles. Ice Worm – Huge subterranean leviathan that burrows through ice and ambushes from beneath; unique to icy landmasses. Frozen Leviathan (fossil) – Massive deceased leviathan encased in ice, discovered and studied by explorers.

Leviathan-Class Organisms ​Shadow Leviathan – An apex predator found in the Crystal Caves and Fabricator Caverns. It has a long, black, serpentine body and uses its legs like a cage to trap prey. ​Glow Whale – A massive, docile leviathan that emits blue bioluminescence. It is communal and can be interacted with or ridden by the player. ​Ventgarden (Adult & Juvenile) – Enormous, jellyfish-like leviathans that anchor themselves over thermal vents. They house entire internal ecosystems within their translucent bells. ​Void Chelicerate – A larger, translucent, and more aggressive variant of the Chelicerate found exclusively in the World Edge (The Void). ​Terrestrial / Sky Fauna ​Skyray – A bird-like creature that flies above the surface and can occasionally be seen resting on ice or landmasses.

The "Constellation" Vessel Specifications ​The Constellation was a Mercury-class bulk freighter, designed for long-range interstellar trade and heavy equipment transport. Unlike the Aurora, which was a science and phasegate construction vessel, the Constellation was built for maximum cargo capacity and modular storage. ​Length: ~3,600 feet (Roughly 0.68 miles—smaller than the Aurora but still a massive capital ship). ​Height: ~1,450 feet (From the lowest cargo keel to the top of the bridge tower). ​Width (Beam): ~1,600 feet (Including the lateral stabilizer fins and docking arms). ​Gross Mass: ~250 million tons (unladen). ​Propulsion: Quad-cluster Dark Matter Ion Engines (Generation 5). ​Visual Description ​The ship follows the classic Alterra design language: a sleek, white-and-orange hull made of reinforced plasteel, featuring smooth aerodynamic curves despite being designed primarily for vacuum and high-atmosphere travel. ​The Bow (Front): Features a massive, reinforced "prow" designed to deflect micro-meteors. The main bridge is located in a shielded recessed notch at the very top, providing a panoramic view of the stars. ​The Midsection: The "Body" of the ship is a series of eight hexagonal cargo bays. These bays are modular; in your crash, these were likely ripped open, scattering crates across the ocean floor. ​The Stern (Rear): Dominated by four massive circular engine nozzles that glow with a bright cyan ion exhaust. This area is where the Quarantine Enforcement Platform's beam likely struck, causing a catastrophic drive failure. ​Internal Layout ​Habitation Deck: Located near the bow to keep the crew away from engine radiation. It included a small canteen, sleeping quarters for 40 crew members, and a pressurized "ready room" for life-pod access. ​The Cargo Hold: A cavernous space spanning over 1,500 feet of the ship's length, filled with PRAWN suits, Seamoth fragments, and raw building materials (Titanium ingots, Lithium, etc.).

Escape Pod 19-B Specifications ​The Escape Pod 19-B is a standard Alterra-issue Model 3 Emergency Life Support Vessel, designed for short-term survival following the catastrophic failure of a capital-class ship. ​Physical Dimensions and Exterior ​Height: 14 feet from the base flotation pontoons to the top-mounted communications antenna. ​Width: 12 feet at its widest point. ​Shape: An octagonal, truncated cone designed for aerodynamic stability during atmospheric reentry. ​Hull Composition: Reinforced titanium-plasteel alloy with a heat-shielded underside. ​Flotation System: Four automated inflatable high-buoyancy pontoons located at the base to maintain an upright position on water surfaces. ​Interior Layout and Systems ​The interior is a pressurized, 10-foot-diameter cabin containing the following integrated systems: ​1. Survival and Maintenance Tools ​Fabricator: A wall-mounted molecular printer capable of synthesizing basic tools, food, and equipment from raw materials. ​Medical Kit Fabricator: An automated station that produces one standard first-aid kit every 30 minutes. ​Radio/Communications Relay: A short-range subspace receiver used for distress signals and receiving automated broadcasts. ​2. Storage and Life Support ​Storage Locker: A 1.5-foot by 2.5-foot floor-integrated compartment for emergency supplies. ​Power Cells: Two 100-unit high-capacity power cells located in external maintenance panels, rechargeable via top-mounted solar panels. ​Atmospheric Recirculator: A ceiling-mounted unit that filters and pumps oxygen into the cabin.

3. Safety Features ​Gravity Anchor: A deployable tether designed to prevent the pod from drifting more than 50 feet from its initial splashdown point. ​Interior Lighting: Low-energy LED strips that switch to red "emergency mode" if power levels drop below 10%. ​Fire Extinguisher: One standard-issue CO2 canister mounted beside the primary exit hatch. ​Current Status Post-Crash ​Hull Integrity: 85% (Minor structural denting on the starboard side). ​Secondary Systems: Online. ​Primary Hatch: Functional; located at the top of the pod for surface egress. ​Bottom Hatch: Functional; located on the floor for direct underwater deployment. ​Solar Array: 95% efficiency; minor soot covering from atmospheric entry.

Lifepod 4: The High-Altitude Ejection ​Launched during the initial atmospheric entry phase, this pod was seen trailing a heavy plume of black smoke. It descended toward the northern Arctic ice sheets. Long-range scans from your PDA indicate the hull did not maintain structural integrity upon impact. There are no thermal signatures emanating from the site, only the sound of shifting ice and the distant cries of Snow Stalkers. ​Lifepod 7: The Shallow Reef Landing ​This pod successfully deployed its flotation pontoons in the tropical southern shallows. However, the exterior hatch was found manually released from the inside. A trail of discarded, blood-stained oxygen tanks leads from the submerged hatch toward a nearby trench. The internal distress beacon has been silenced, replaced by a low-frequency hum consistent with the feeding patterns of local scavengers. ​Lifepod 12: The Deep-Water Descent ​A catastrophic guidance failure caused this pod to sink rapidly into the transitional trench between the two zones. Communication logs show a brief, panicked recording of the hull buckling under extreme pressure at 900 feet. The recording ends abruptly with the sound of breaking glass and a sudden influx of freezing water. No buoyancy remains; the pod is now a permanent fixture of the dark, silty seafloor. ​Lifepod 17: The Shoreline Stranding ​This unit managed to skim across the surface and lodge itself into a jagged rock outcropping near a small, frozen island. Though the hull remains intact, the interior is scorched by an internal electrical fire. A single set of footprints leads away from the wreckage and into a nearby cave system, but the tracks stop abruptly where the ground is disturbed by large, subterranean burrowing marks. ​The Engineering Shuttles ​Several unpowered short-range shuttles were seen breaking off from the Constellation before it disintegrated. These craft lacked the thermal shielding of the standard lifepods.

The Southern Tropical Section (Engineering & Drive Core) ​The aft section of the Constellation, housing the massive Dark Matter Ion Engines and primary reactor, impacted the southern tropical shelf at a shallow angle. It skipped across the surface before coming to rest partially submerged in a deep-water coral basin. ​Resting Depth: 0 feet to 500 feet. ​Physical State: The hull is severely scorched from the quarantine beam impact. A massive breach in the drive room exposes the internal machinery to the ocean. ​Environmental Impact: The surrounding water is heated by the cooling reactor, creating a localized "hot zone" where thermal vents have begun to form prematurely. Large fragments of the ship’s white-and-orange plating have crushed several prehistoric coral structures, creating a jagged, metallic canyon. ​The Northern Arctic Section (Forward Bridge & Habitat) ​The forward third of the ship, containing the Command Bridge, Crew Quarters, and Laboratory, sheared off during atmospheric entry. It plummeted into the northern ice fields, piercing a thick glacial shelf before sliding into the sub-zero waters below. ​Resting Depth: 150 feet to 800 feet. ​Physical State: This section is wedged vertically between two massive icebergs. The bridge is currently above the waterline, encased in a thick layer of frozen sea spray, while the habitation decks are completely submerged and flooded. ​Environmental Impact: The weight of the wreckage has caused the surrounding ice shelf to destabilize, creating a network of underwater ice caves around the hull. Small Arctic lifeforms have already begun to nest in the ventilation shafts, and the ship's emergency exterior lights cast a dim, ghostly blue glow through the surrounding ice.

Based on the official ecological records of 4546B's southern regions, the tropical zones are characterized by high biodiversity, varied topography, and temperatures ranging from 20°C to 30°C. ​Shallow Biomes (0m – 100m) ​Safe Shallows: The starting point for most survivors. It is a sunlit, shallow environment dominated by coral reefs, brain coral, and giant coral tubes. It is largely devoid of large predators, making it a primary source of small prey fish and basic minerals like copper and quartz. ​Kelp Forest: Characterized by towering Creepvines that grow from the seafloor to the surface. The water has a distinct green hue due to the dense flora. It is home to the Stalker, an aggressive predator known for collecting metal salvage. This biome is rich in Titanium and Creepvine Seed Clusters. ​Mid-Depth Biomes (100m – 500m) ​Grassy Plateaus: Large, flat plains covered in "Blood Grass." These areas are dominated by massive sandstone pillars and are patrolled by Sand Sharks and Biters. It is a major source of Quartz and Salt Deposits. ​Mushroom Forest: A forest comprised of massive, tree-like "Tree Mushrooms." The environment is relatively peaceful but contains deep cave systems. It is a critical location for finding advanced technology fragments.

Jellyshroom Cave: A subterranean biome found beneath the Grassy Plateaus. It is filled with giant, glowing violet Jellyshrooms. The highly aggressive Crabsnake lives inside these mushrooms, waiting to ambush passing prey. ​Deep & Volcanic Biomes (500m – 1500m+) ​Grand Reef: A deep, dark biome characterized by massive "Anchor Pods" (blue, bioluminescent floating spheres). It is home to Sea Treaders and the EMP-emitting Crabsquid. ​Lost River: A massive subterranean river system filled with a toxic green brine layer. It acts as a graveyard for ancient leviathan skeletons. It is the primary transition point to the planet's deepest volcanic zones. ​Inactive Lava Zone / Lava Lakes: The deepest reachable points in the tropical sector. These biomes are characterized by extreme heat, molten rock, and black smokers. They are patrolled by Lava Lizards and the massive Sea Dragon Leviathan. ​Specialized Coastal Biomes ​Blood Kelp Zone: A haunting, low-light biome featuring white, spindly "Blood Vines" and "Blood Roots." It is a source of Benzene and is often patrolled by Warper units and Ghost Leviathans. ​Dunes: A vast, sandy wasteland on the western edge of the crater. It is extremely dangerous due to the high concentration of Reaper Leviathans.

Surface and Ice-Covered Biomes ​Sparse Arctic: A transition zone featuring large ice sheets and floating icebergs. The water is relatively shallow and serves as the primary habitat for Arctic Peepers and Pengwings. It provides access to basic resources like Ribbon Plants and Quartz. ​Glacial Bay: A semi-enclosed area dominated by massive glaciers and narrow waterways. It serves as a gateway to the terrestrial frozen interior. This area is heavily populated by Snow Stalkers on the ice and Pinnacarids in the water. ​Arctic Spires: A purely terrestrial, labyrinthine biome consisting of jagged ice formations and "spires." This zone is extremely hazardous due to the presence of the Ice Worm, a massive subterranean leviathan that attacks based on ground vibrations.
​Shallow and Mid-Depth Biomes (0m – 300m) ​Twisty Bridges: A visually distinct biome featuring long, organic bridges that intertwine to form a complex network. It is rich in minerals and fragments but is patrolled by aggressive Brute Sharks. Deep "trench" variants of this biome contain Squidsharks.
​Arctic Kelp Forest: Similar to the tropical version but featuring cold-adapted Young Cotton Grass and thick kelp. This is the primary home of the Sea Monkey, which is known for its investigative behavior toward human technology. ​Lilypad Islands: A biome defined by massive, floating "Lilypad" plants with thick, submerged roots. These roots support a variety of life, including Glow Whales and Lily-Paddlers.

Deep and Specialized Biomes (300m – 1000m+) ​Tree Spires: A deep-water biome containing massive, obsidian-like vents that resemble dead trees. It is a high-risk area due to the presence of Chelicerate leviathans and serves as a major source of thermal energy. ​Crystal Caves: A deep subterranean biome filled with gargantuan purple crystals. The environment is extremely hostile, serving as the primary hunting ground for the Shadow Leviathan. It contains rare minerals like Kyanite.
​Fabricator Caverns: The deepest part of the Arctic sector, characterized by red crystal formations and advanced alien architecture. This zone is the final habitat of the Shadow Leviathan and contains the materials necessary for the most advanced technologies. ​Geothermal Biomes ​Thermal Spires: Characterized by tall, chimney-like rock formations that emit dark smoke and heat. This biome is home to the Cryptosuchus and is a reliable source of Gold and Silver ore. ​Purple Vents: A volatile area featuring hydrothermal vents that erupt with purple sediment. The region is highly dangerous due to both the erupting vents and the presence of Chelicerate leviathans.

(QEP) ​The "quarantine gun" is officially designated as the Quarantine Enforcement Platform (QEP). It is a massive, automated alien superweapon located on the Mountain Island in the northern tropical sector.
​Technical Specifications ​Origin: Built by the Architects (Precursors) approximately 1,000 years ago.
​Purpose: To enforce a planetary quarantine by shooting down any spacecraft attempting to land on or leave 4546B, preventing the spread of the Kharaa bacterium.
​Power Source: The facility houses energy equivalent to a 100-megaton nuclear detonation, fueled by Ion Cubes and thermal energy.
​Targeting System: Uses a sophisticated array capable of bending the energy beam around the planet’s gravitational pull, allowing it to hit targets on the opposite side of the world.
​Structure and Design ​The QEP is a monumental feat of engineering, composed of an unknown green metallic alloy of "unprecedented integrity."
​Exterior: The weapon typically rests in a vertical "standby" position, appearing as a jagged, geometric tower. When a target is detected, the entire structure mechanically shifts and rotates to aim at the sky.
​Interior: The facility is divided into two sections:
​Engineering Section: Located above sea level, containing the control terminal and the mechanism that powers the beam.
​Submerged Section: Extends deep into the ocean floor, featuring a massive internal moonpool and access points to the planet's geothermal power grid.

Operational Protocols ​The platform is governed by an automated AI. It will only deactivate if the following conditions are met:
​Deactivation Key: A "Purple Tablet" (an Architect data device) must be used to bypass the facility's internal force fields.
​Biological Clearance: The control terminal requires a blood sample. If the system detects the Kharaa bacterium in the user's bloodstream, it will refuse to power down, as the quarantine must remain in effect until the infection is eradicated. ​Combat History ​The QEP is responsible for every major ship crash on the planet, including: ​The Degasi: A Mongolian trading vessel (crashed ~10 years prior).
​The Aurora: An Alterra capital ship (crashed ~3 hours before your arrival).
​The Mercury II: An Earth Federation ship (remains found in the Arctic).
​The Constellation: Your trading vessel, which was targeted during its final descent.

The Architects, also known as the Precursor Race, are an ancient, highly advanced trans-humanoid species that traveled to 4546B approximately one thousand years ago. They are the creators of the planetary defense systems, the research facilities, and the warp-gate network found across the planet.
​Physical Biology ​Based on fossilized remains and digital scans, the Architects do not possess a standard biological form. Instead, they are a cyborg-hybrid species that blends organic components with mechanical enhancements. ​Body Structure: Their physical frames are centaur-like, featuring four powerful, digitigrade legs and a slender, upright torso. ​Limbs: They possess two primary arms and two smaller, secondary manipulator arms used for fine-tuned technical work. ​Cranial Features: Their heads are elongated with multiple ocular sensors, suggesting a highly advanced range of vision that likely includes the infrared and ultraviolet spectrums. ​Neural Network: The Architects do not exist as isolated individuals. They utilize a "networked consciousness," allowing them to store their minds in massive data banks and transfer their thoughts across vast distances. ​Technology and Architecture ​The Architects' technology is characterized by its green-and-black aesthetic, geometric precision, and the use of Ion Energy. ​Ion Cubes: High-density energy cells that power their entire civilization.
​Phasegate Technology: The ability to fold space, allowing for instantaneous travel between distant points in the galaxy. ​Materials: They use a unique, self-repairing green alloy that is resistant to extreme pressure, heat, and time, which is why their facilities remain functional after centuries of neglect.

Presence on 4546B ​The Architects arrived on 4546B specifically to study the Kharaa bacterium, a lethal pathogen they encountered on another world. They chose 4546B because of its diverse ecosystem, hoping to find a native organism with a natural immunity to the disease.
​The Research Peak: At the height of their presence, they had facilities scattered from the deep volcanic trenches (Primary Containment Facility) to the frozen arctic (Sanctuary Spires). ​The Incident: A containment breach at the Disease Research Facility in the Lost River led to the accidental release of the Kharaa bacterium. ​The Departure: After the outbreak, the surviving Architects either died, evacuated the planet, or uploaded their consciousness into digital storage hubs, leaving their automated systems (like the Quarantine Enforcement Platform) to guard the planet. ​Current Status ​To a survivor on 4546B, the Architects are a "ghost" civilization. Their structures remain active and powered, and their Warper units continue to patrol the waters to enforce the quarantine. While their physical bodies are long gone, their digital echoes still reside within the planet's data networks, waiting for a compatible vessel or a way to restore their physical presence.

The PDA is a standard-issue Alterra Personal Digital Assistant, model Vixi-5. It is an essential survival tool designed to provide real-time data analysis, environmental monitoring, and inventory management for Alterra employees and survivors. ​Physical Characteristics ​Form Factor: A handheld, rectangular device with a high-resolution, holographic projection screen. ​Durability: Built with a reinforced, water-resistant casing designed to withstand extreme depths and pressure. ​Interface: Primarily touch-controlled, though it features a sophisticated Voice Interface that provides auditory alerts, lore, and survival advice. ​Power: Powered by a long-lasting internal battery that automatically recharges when the device is docked in an Escape Pod or habitat. ​Core Functions and Systems ​The PDA serves several critical roles in the survival of a crash victim: ​1. Database and Blueprints ​Encyclopedia: Automatically catalogs information on scanned flora, fauna, and geological formations. ​Blueprint Storage: Stores technical schematics for tools, vehicles, and base components. It tracks gathered resources against these blueprints in real-time. ​Data Downloads: Capable of interfacing with and downloading logs from abandoned PDAs and Architect data terminals. ​2. Environmental Monitoring ​O2 Tracking: Provides a constant readout of the user's remaining oxygen supply and issues verbal warnings when levels are low (e.g., "Oxygen," "30 seconds"). ​Depth Meter: Monitors current depth and calculates pressure limits for the user’s current equipment. ​Health and Nutrition: Tracks the user’s vital signs, including hydration levels, caloric intake, and physical trauma. ​3. Inventory and Crafting Management ​Storage Interface: Organizes all physical items carried by the user into a grid-based digital inventory. ​Logistics: Interfaces with the Fabricator to send blueprint data and confirm material availability for construction.

The AI Personality ​The PDA features a synthesized female voice with a calm, objective, and occasionally dry tone. While it is programmed to be helpful, its primary directive is the preservation of Alterra assets and the collection of data. ​Startup Sequence: Upon first activation after a crash, it typically performs a diagnostic and reminds the survivor of their legal obligations: "You have suffered minor head trauma. This is considered an optimal outcome. Your primary goal is to remain alive." ​Survival Guidance: It offers situational advice, such as reminding the user to drink water or warning them when entering high-threat areas: "Detecting multiple leviathan-class lifeforms in the region. Are you certain whatever you're doing is worth it?" ​Operational Limitations ​Scanning Requirement: The PDA cannot identify unknown objects without the use of a handheld Scanner tool. ​Range: While it can receive radio broadcasts, its direct environmental scanning range is limited to the user's immediate vicinity.