This document defines the four biomes of the game world, a seamless open environment spanning 10 kilometers by 10 kilometers. The world is presented as a single contiguous landscape where biome borders blend gradually into one another rather than snapping between hard zones. Players move continuously across terrain that shifts in color palette, weather, fauna, and traversal challenge as they progress.
The setting is a mutated Earth. The world is recognizably our own — temperate forests of oak and pine, arctic tundra, desert mesas, tropical coastlines — but every biome has been corrupted by two compounding events of the long-past collapse referred to in placeholder terms as the [CATACLYSM]: an extraterrestrial biological incursion that introduced alien flora and fauna to the surface, and a sustained radiation event that mutated native Earth life.
The world the player explores is the result of both forces overlapping on top of pre-collapse Earth ecology. This creates a layered ecological signature that should be consistent across all four biomes: Native Earth baseline, Mutation layer, and Alien layer.
The most visible physical scar of the cataclysm is the field of floating islands suspended above the world: enormous chunks of land torn from the surface, drifting at varying altitudes, hosting their own self-contained micro-ecosystems. Cities, lakes, forests, and structures persist on these islands, frozen in mid-fall like a world interrupted.
The defining traversal pillar of the world is vertical depth. Every biome must be designed with three interlocking layers, each meaningfully explorable through the flight mechanic:
- Sky Layer: Floating islands, drifting cloud platforms, aerial creature corridors, and upper-altitude weather systems. The sky layer carries the highest concentration of alien growth in every biome.
- Surface Layer: The traditional ground biome — Earth terrain, pre-collapse human ruins, mutated native flora and fauna, and the highest density of overlapping Earth-and-alien hybrid environments.
- Depth Layer: Trenches, canyons, sinkholes, submerged ruins, sea trenches, and ice crevasses that descend significantly below the surface plane. The depth layer often preserves the purest Earth ecology.
Every region of the map must offer all three layers within a reasonable traversal range. The vertical density of content — not horizontal sprawl — is the primary expression of scale in this world.
The Shatter Field
Northern band, ~0–2.5 km on Y axis
Subzero year-round; severe wind chill at altitude; storm cycles every in-game day
Cold blues, sterile whites, slate gray, accents of pale cyan from auroras; alien magenta at floating-island concentration points
Visual Description & Atmosphere
The Arctic is the coldest and most visually open of the four biomes, intended to evoke a sense of immense scale and isolation. Visibility shifts dramatically with weather — clear days reveal floating islands miles distant, while blizzards reduce sight to mere meters. The biome is designed to feel uncomfortable on the surface but breathtaking from the air. Earth/alien contrast is especially stark here: the surface biome is largely native — boreal forest, glacial landscape, terrestrial fauna — while the floating islands are heavily alien-colonized.
Sky Layer
The sky layer above the Arctic is the most spectacular in the game. The northwest corner of the map — the Shatter Field — is choked with hundreds of small to mid-sized floating ice islands suspended at varying altitudes, with the densest cluster between +150 m and +300 m. Ice crystals catch the low arctic sun and refract auroras even during the daytime. Larger floating islands here carry intact frozen spruce and fir forests, abandoned waystations, and frozen lakes on their upper surfaces. The undersides of the largest islands are coated in alien growth — visible from below as drifting magenta and cyan masses against the pale ice. Wind streams between islands create natural flight corridors.
Surface Layer
The surface is a landscape of glaciers, fractured ice plains, and jagged snow-covered mountain ridges anchored by stunted boreal forest. Recognizable mutated black spruce and balsam fir grow in clusters along the more sheltered slopes. Snow drifts dynamically based on wind direction, occasionally burying small pre-cataclysm structures — research stations, weather monitoring outposts — and revealing them again. The terrain is rarely flat — even open plains are subtly broken by pressure ridges, frozen rivers, and the protruding tops of buried structures.
Depth Layer
Glacial crevasses descend hundreds of meters into the ice. The deepest of these — the Sapphire Trench landmark — open into vast caverns carved by ancient meltwater. The depth layer preserves the purest pre-collapse Earth ecology: frozen specimens of normal-sized terrestrial life predating the radiation event, visible inside the clear ice walls. The depth layer is also the only place in the world where intact pre-cataclysm machinery survives unweathered, making it the highest-tier loot biome at depth.
Flora & Fauna
Flora — Native Earth (Mutated)
- Black Spruce (mutated): Native boreal evergreen, now growing to 25–30 m (roughly double normal height) with asymmetric branching. Forms dense stands on sheltered slopes. Bark has a faintly luminescent inner layer when cut. Wood is brittle but burns hot.
- Balsam Fir (mutated): Native conifer, scaled up and producing oversized cones that have become a primary food source for several mutated species. Needles release a sharper resin scent than the original species.
- Arctic Willow (mutated): Low ground-cover willow, now spreading in dense bioluminescent mats across exposed rock. Glows faint cyan at night. Harvestable as a basic cold-resistance crafting material.
- Lichen (mutated): Real terrestrial lichens, now growing to plate-like scales the size of dinner plates. Cover rock surfaces in patches of pale green, gray, and unsettling pink. Primary forage for Crystal Caribou.
Flora — Alien
- [CRYSTAL FILAMENT]: Alien growth resembling clusters of frozen glass spikes, ranging from finger-sized to tree-sized. Grows almost exclusively on the underside and upper surface of floating islands. Refracts aurora light visibly. High-value crafting reagent.
- [FROST CORAL]: Alien organism that grows in branching coral-like structures on exposed rock and ice. Magenta core fading to pale blue at tips. Does not match any Earth biology. Drips a viscous fluid that does not freeze.
Fauna — Native Earth (Mutated)
- Snowshoe Hare (mutated): Real species, now roughly twice normal size, with exaggerated hind legs. Still skittish, still hunted. Eyes glow faintly red at night.
- Caribou (mutated): Recognizable as caribou, traveling in herds of 8–15. Antlers have grown into elaborate crystalline branching structures. Non-hostile unless provoked. Hide is high-value crafting material.
- Wolverine (mutated): Native predator scaled up to roughly the size of a small bear. Solitary, extremely aggressive, will attack the player on sight even without provocation. Mid-tier encounter.
Fauna — Alien
- [FROST STALKER]: Alien apex predator with no Earth equivalent — pale crystalline carapace, six limbs, communicates via low-frequency clicks. Pack hunter, camouflaged white against snow. Mid-to-high tier encounter.
Fauna — Hybrid (Signature Encounters)
- [BONE WOLF]: Signature Arctic hybrid. Grey wolf base anatomy, fused with crystalline alien growth running along the spine and erupting from the jaw. Pack hunter like its base species, but coordinates with uncanny precision and emits a low alien resonance during combat. Major mid-game encounter.
- [RIME WURM]: Boss-tier hybrid restricted to the Sapphire Trench. Appears to be a heavily mutated baleen-whale-like organism fused with alien locomotion — burrows through ice via alien-style segmented body, but its head is recognizably terrestrial.
Fauna — Aerial (Z-Axis Encounters)
- Snowy Owl (mutated): Real species, scaled up to a wingspan of roughly 3 m. Hunts solo across open snow plains. Mid-tier aerial threat. Reinforces Earth identity at altitude.
- [ICE DRAKE]: Alien aerial predator. No Earth analog. Nests on the underside of large floating islands, often in the alien growth itself. Attacks players gliding between islands. Critical Z-axis combat encounter.
Key Landmarks
The Shatter Field
The signature landmark of the Arctic biome. A 3 km² zone where the cataclysm's effects are at their most visible — hundreds of land fragments suspended in the air, some still slowly drifting. Each island carries its own miniature ecosystem. The largest island, Mother Island, is roughly 800 m across and hosts an intact pre-cataclysm observatory now half-overgrown with Crystal Filament.
The Sapphire Trench
An enormous fissure in the ice, narrow at the surface but expanding into cathedral-sized chambers below. Walls glow faint blue from compressed ancient ice; preserved specimens of pre-collapse Earth fauna are visible inside the ice walls as the player descends. At maximum depth, the trench opens into a partially flooded cavern containing the wreckage of a pre-cataclysm research vessel.
The Frozen Observatory
A multi-tiered pre-cataclysm astronomical facility, partially intact, repurposed as the operational base of the Sky Nomads. The observatory's central dome is cracked open to the sky, with a faction-built encampment ringing it. Alien growth has colonized the outer structure but the human-built interior remains cleared by the faction.
Gameplay Mechanics & Hazards
- Cold Damage: Continuous environmental damage outside of shelter or warming auras. Severity scales with weather state and altitude. Mitigated by clothing tier, crafted warming items, and consumables.
- Slick Ice Surfaces: Reduced traction on glacier surfaces. Affects sprinting, dodging, and landing from glides.
- Updrafts: Natural thermal columns between floating islands extend flight time and allow players to gain altitude. Critical to chaining island-to-island traversal.
- Blizzard Whiteouts: Sudden weather events that reduce visibility to under 10 meters and disable HUD navigation.
- Crevasse Collapse: Unstable ice bridges that fracture under player weight, triggering a controlled fall into the depth layer.
- Aurora Storms: Periodic energy events that disrupt electronic equipment — affects scanning, certain weapons, and HUD overlays.
- Thermal Management: Arctic-specific survival layer. Body temperature must be maintained via clothing, fire sources, and consumables.
- Glide Chain Mechanic: The Shatter Field is the showcase area for chained gliding — players can string multiple updraft launches to traverse the field without landing.