Xylos-Prime

Xylos-Prime is a marvel of subterranean engineering centered around a massive multi-story dome. The city glows with artificial bioluminescence and hums with the steady vibration of geothermal turbines. Residents live in tiered modular housing that overlooks the rushing Emerald River. Science labs and micro-farms line the cavern walls, creating a self-sustaining ecosystem. It is a place of cold logic, high technology, and hidden shadows beneath the heavy weight of the world.

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City

Xylos-Prime

The bioluminescent heartbeat of the deep crust

TypeCity

Population5000

WealthHigh

GovernmentScientific Technocracy

ReadinessVery High

“A sterile and humid environment lit by soft neon glows”

Gallery

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Connections

Geography

RegionThe Subterranean Reach

ClimateConstantly humid and temperate

TerrainA vast crystalline cavern with a central rushing river

Travel Links

Magnetic rail tunnelsGrav-lift surface shaftsUnderground canal barges

Culture

A dedication to scientific advancement and collective survival

Races

XylariSynthetic ConstructsDeep-Dwarves

Religions

The Path of the Eternal CircuitThe Cult of the Geode

Arts & Entertainment

Light-weaving performances and sonic-resonance sculpting

History

Xylos-Prime was founded after the Great Descent when the Xylari species fled a dying sun. Carving their sanctuary into the deep crystalline strata, they harnessed the planet's geothermal heart. The central dome serves as both a physical and ideological anchor, housing the elite scientific minds who maintain the delicate balance of oxygen and energy. Today, it is a beacon of cold logic and neon-hued life beneath the silent stone crust.

The FoundingThe First SparkThe initial geothermal vents were tapped to provide permanent power.

The Middle AgeThe Bioluminescent BloomGenetically modified flora replaced the need for surface-imported food.

Government

LeaderPrime-Archon Valerius

Scientific Technocracy

Key Laws

Energy siphoning is a capital offenseMandatory biological data sharing

Problems

The Siphon Sabotage

A mysterious group is draining power from the central dome.

Economy

Industries

Geothermal powerBio-medical research

Scarcity

Natural sunlight

Wealth LevelHigh

Exports

Power cellsMedicinal moss

Imports

Raw iron oreSurface seeds

Defenses

ReadinessVery High

Fortifications

Plasma shieldingAutomated turret arrays

The Iron Sentinels(400 soldiers)

Highly disciplined guards equipped with thermal-sight goggles and pulse spears.

Law & Order

crime Level: Low
enforcement: Drone-assisted surveillance
typical Punishment: Memory-reprogramming or hard labor in the heat-sinks

Prime-Archon Valerius

NPC

City Leader

A tall, grey-skinned man with glowing blue veins and silver robes.

Overseer Kael

NPC

Logistics Chief

She wears a sleek black jumpsuit and carries a multi-tool baton.

Researcher Zinn

NPC

Bio-Engineer

A metallic humanoid with flickering green optical sensors.

Brix the Bold

NPC

Scavenger

A stout man with a beard braided with fiber-optic cables.

The Geode Exchange

Shop

General Supplies

A shop carved directly into a massive amethyst geode.

The Vapor Lounge

Tavern

Scientists and off-duty guards

A sleek bar filled with mist and floating furniture.

The Technic Union

Faction

Ruling Body

The elite scientists and engineers who run Xylos-Prime.

The Surface-Seekers

Faction

Rebel Group

A clandestine group who believe the underground is a prison.

The Emerald River

Point of Interest

A glowing green river that provides both transport and irrigation.

The Geothermal Heart

Point of Interest

A massive vertical turbine that powers the entire city.

The Hanging Gardens

Point of Interest

Vertical micro-farms that grow bioluminescent fruits.

Calendar of Events

Every Solar Cycle

The Great Reset

A day when all non-essential systems are powered down for maintenance.

The city's security drones also shut down, allowing for unchecked crime.

Secrets

The central dome is a dormant colonization starship

WorldHidden blueprints in the Archive of Pulsars

The geothermal energy is being siphoned to feed a subterranean beast

LocalStrange biological growths near the heat-vents

Rumors

The Archon hasn't aged in fifty years.

The Emerald River is actually toxic waste.

There is a map to the surface hidden in the tavern's cellar.

Plot Hooks

The Cooling Core

The geothermal heart is failing and needs a rare crystal from the deep caves.

Urgent MissionResearcher ZinnA customized pulse-rifle and city citizenship

The Siphon Trail

Track down the illegal power cables to find the saboteurs' hideout.

InvestigationOverseer Kael1000 credits and a high-clearance pass

Escape to the Sun

Help a group of Surface-Seekers navigate the tunnel found by Brix.

EscortBrix the BoldA map of the surface world and rare artifacts

Visual sheet

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