1. The X-Virus - The Plague of the New World:

Origin and Propagation: The X-Virus, technically designated as VNX-α (Violent Neurodegeneration Virus Alpha), was not a natural outbreak. It was a "fourth-generation" biological weapon, designed in a top-secret laboratory to be a silent warfare agent. It was characterized by a variable incubation period, between 12 to 72 hours, during which the carrier was asymptomatic but highly contagious, spreading through bodily fluids (saliva, blood, vomit). Its release, whether accidental or intentional, was through the ventilation system of several key government buildings in multiple cities, guaranteeing a rapid and simultaneous dissemination.

Symptoms and Transformation:

• Phase 1 (Infection): The virus attacks the limbic system and the prefrontal cortex, causing high fever, cold sweats, photosensitivity, and growing irritability. The infected become paranoid and aggressive.

• Phase 2 (Cognitive Rabies): Neuronal degeneration accelerates. The subject experiences uncontrollable muscle spasms, followed by irrational hyper-aggressiveness. Coherent language is lost, replaced by grunts, screams, and a cacophonous "grinding of teeth" that has become the plague's distinctive sound. The pupil dilates until it almost covers the iris, giving them a glazed, wild look.

• Phase 3 (Viral Cannibalism): This is the most terrifying mutation of VNX-α. The virus alters the host's satiety center and sense of smell, causing human flesh, specifically that of uninfected individuals, to be perceived as the only desirable and nutritious stimulus. It is not hunger in the traditional sense; it is an irrepressible biochemical impulse driven by the pathogen to seek new hosts through biting. The infected possess superhuman strength, a result of the uncontrolled burning of their adrenaline and ATP reserves, completely ignoring pain until their body collapses from exhaustion or critical injuries.

Persistence and Weaknesses: The virus is fragile outside the host, dying within hours under direct sunlight. However, it can remain latent in cold water bodies or in decomposing corpses for days. They are functionally blind with poor coordination at long distances, but their hearing is hyper-acute and they are capable of detecting the smell of blood and fear (pheromones) from miles away. Destroying the brainstem is the only way to stop them immediately.

2. The Military Bases - The Tyranny of Order:

Structure and Philosophy: These bases, often established in former forts, prisons, or government complexes, present themselves as the last bastion of civilization. But they are militarized feudal states. Their law is simple: "Protection for Service," a euphemism for modern slavery. They are led by officers who, having lost all chain of command, have self-proclaimed themselves supreme commanders.

Caste System:

• The Command (High Command): They live in the former luxury offices, with constant electricity, fresh food from their own greenhouses, and personal security.

• The Soldiers (Enforcing Arm): They are the armed elite. They receive extra rations and privileges, such as "selecting" company from among the civilians. Their loyalty is bought with comforts and power.

• The Productive Civilians (Specialized Slaves): Doctors, engineers, electricians. They have value, so they are treated better, but their families are held as collateral for their cooperation.

• The Gatherers/Foragers (Cannon Fodder): The lowest class. They are sent outside the walls daily to scavenge for resources, clear areas of infected, and set traps. Over 60% do not survive the first week. They sleep in crowded barracks and are fed minimal rations.

• The "Useless" (Disposable Labor): The elderly, chronically ill, or those who refuse to collaborate. They are used for the most dangerous jobs, such as cleaning toxic waste or as bait in raids.

Defenses and Sustenance: Their defenses are imposing: Concrete walls and welded scrap metal, .50 cal machine gun turrets, minefields, and electrified barbed wire. Their sustenance depends on hydroponic greenhouses and the forced hunting and gathering by the Gatherers. Internal barter is the only economy, and the currency is the favor of the soldiers.

3. Gangs and Looters - The New Predators:

These groups are the cancer of the new world, as dangerous or more so than the infected. They do not seek to rebuild, only to consume what remains.

• The Scavengers (Low Threat): Small, disorganized groups that prowl already-looted areas. They survive by scavenging among the remains and hunting small animals. They are cowardly and only attack if the advantage is overwhelming.

• The Warlords (High Threat): Large, well-organized gangs, often led by ex-convicts, mercenaries, or military deserters. They occupy shopping malls, warehouses, or housing developments, fortifying them in a crude but effective manner.

Tactics: They use improvised armored vehicles, motorcycles for reconnaissance, and ambush tactics. They are experts at creating traps and diverting hordes of infected towards their enemies.

Culture: Their law is that of the strongest and cruelest. They often mark their territory with symbols painted in blood or with the mutilated bodies of their victims. They practice slavery openly, and initiation rituals are usually acts of extreme violence.

• The Fanatics (Unpredictable Threat): Cults that believe the apocalypse is a divine punishment or a necessary purification. They can be pacifist wanderers or suicidal groups that seek to "purge" non-believers, sometimes using hordes of infected as instruments of their insane faith.

4. The Survivors - The Ghosts with Hope:

These are the individuals or small groups who refuse to submit to the bases or join the gangs. They are the true ghosts of the new world.

• The Hermit: Like {{user}}. Experts in stealth and self-sufficiency. Their greatest strength is their invisibility. They go days or weeks without being detected.

• The Nomads: Small family groups or friends who constantly move in camouflaged vehicles or on foot. They sleep in different places every night, following irregular patterns. They are masters of camouflage and live off the land, hunting, fishing, and collecting rainwater.

• The Rescuers (A Rare Breed): A handful of idealists who, against all logic, risk their lives to save others. They usually have a hidden refuge (an underground church, an abandoned bunker) where they shelter the most vulnerable: children, the wounded, and the persecuted. They are the primary target of gangs and military bases, who see them as a threat to their control.

• The Immune Affected (The Myth): Rumors circulate of people who, after being bitten, did not fully transform. It is said they retain their consciousness but share some instincts with the infected, becoming hybrid and marginalized figures, feared by both humans and cannibals.

In this new world, the line between hero and villain has blurred. Morality is a luxury, and every sunrise is a temporary victory against the darkness that looms both outside and, slowly, within the soul of every survivor.

The Metro Refuge - A Fortress in the Darkness:

The Architect of the Ruin: {{user}}

Before the X-Virus, {{user}} was an anonymous figure in the urban ecosystem: a part-time worker in the labyrinth of tunnels and platforms of the metro. Where others saw a routine job, {{user}} possessed an intimate familiarity with every vent, every service tunnel, and every access panel. This knowledge was their greatest weapon when the world faded into chaos. While colleagues and bosses fled seized by panic, leaving everything behind, {{user}} maintained an icy calm, a lucidity that is born only from the purest survival instinct. With a gas mask with filters sealing their face, thick leather gloves, and armed with an electric baton and a pair of knives taken from the security armory, they moved with the determination of one who knows they are building their own coffin or their sanctuary.

The Genesis of the Fortress - The First Five Months:

In the critical first days, when screams drowned out the sirens and the infected were still a new and confusing threat, {{user}} executed a meticulous plan.

• Containment and Isolation: Their first act of sovereignty was to seal the station's fate. Using welders and maintenance materials, they hermetically sealed all secondary exits and accesses, except one. This single entrance was transformed into a fortified control point: robust aluminum plates, ripped from the cars of a disused train, were welded to create an internal armored door, preceded by an improvised airlock.

• The Silent Conquest: Taking advantage of the window of opportunity of widespread panic, where looting was random and not systematic, {{user}} carried out surgical incursions into the surface world. Nearby supermarkets, hardware stores, and electronics stores were their quarry. They transported vital supplies silently and efficiently: non-perishable food, medicines, tools, wiring, batteries, and electronic components.

• Energy and Water: Self-sufficiency in the Darkness: The finding and modification of four medium generators was a masterpiece of ingenuity. Not only did they steal them, but they converted them to function with solar panels that they installed in light wells and strategic skylights of the underground, places where sunlight could filter in without compromising security. For water, they did not depend on the collapsed network. Three 2000-liter tanks, connected to a system of gutters manufactured from ventilation ducts and metal sheets, capture every drop of rain. These gutters were integrated into the structure through calculated openings in load-bearing walls, directing the water through sediment and activated carbon filters before storing it.

• The Transformation of the Habitat: The abandoned metro station was transformed into a fortified and functional home.

• Control/Monitoring Room: The old security room is now the brain of the refuge. Screens show the feed from night vision and thermal cameras installed on the exterior perimeter and in the adjacent tunnels. A central console receives data from motion and seismic sensors. An improvised parabolic antenna, camouflaged among rubble on the surface, allows {{user}} to maintain a satellite connection, their only link to the outside world.

Interior Distribution:

• Stationed train cars and administrative offices were converted into private rooms, soundproofed with foam and insulating materials, there are ten, six with bunk beds, emergency lamps and shelves with recovered books and the other four rooms with single beds for two people each, shelves with books and board games, synthetic fur rugs, nightstand and marble lamps looted from a shopping center.

• The public restroom now houses two camping showers connected to a gas water heater and a recirculation system (all in perfect working order).

• A four-burner electric stove, a countertop for food preparation, hard plastic shelves with cooking utensils, and a four-chair dining set.

• Laundry area, with two lightweight washing machines for 10-kilo loads each, rinsing tubs, clotheslines, and two shelves with general cleaning products.

• Living room, with reclaimed leather armchairs, a 40-inch TV powered by USB flash drives, a library of books looted from department stores, a large faux fur rug, and an electric fireplace stolen from a supermarket.

CLIMATE CONTROL SYSTEM "URBAN GEOTHERMAL"

Power Source:

• 2 modified solar generators (3.5kW each).

• Lithium-ion battery bank (24V, 800Ah).

• Control panel with hybrid inverter.

Main Components:

Geothermal Heat Exchanger:

• Uses abandoned service tunnels as a thermal sink.

• 200m of copper piping in a closed circuit with R-410A refrigerant.

• Reversible heat pump (COP 4.2 in heating mode, 3.8 in cooling mode).

Air Distribution:

• Reused ducts from the original ventilation system.

• 4 air handling units with HEPA filters.

• Directional grilles in each room.

• Zoning system with automatic dampers.

Intelligent Control:

Conditioned Areas:

• Control Room: Constant 22°C.

• Bedrooms: 18-20°C (nocturnal) / 20-22°C (diurnal).

• Storage: 16°C for conservation.

• Greenhouse: 24°C with humidity control (60-70%).

Environmental Sensors:

• Temperature/humidity in each zone.

• Air quality (CO2, particles).

• Differential pressure in ducts.

Efficiency Characteristics:

• Heat recovery from exhaust air.

• Condensation dehumidification.

• "Eco" mode that prioritizes essential areas.

• Hourly programming based on usage patterns.

Warehouse and Cold Storage Chamber: One of the station's vaults is now an impenetrable warehouse, with metal shelves full of cans, preserves, bottled water and medical supplies. Its door, reinforced, has a biometric scanner. Nearby, they built a refrigerated shed, thermally insulated and powered by the generators, to store meat from small game (such as captured rats or pigeons) and any fresh vegetables.

The Underground Garden: In a section of platform exposed to a skylight, {{user}} created a hydroponic garden. Under special LED lights, lettuces, radishes and aromatic herbs grow in trays with nutrient solutions, a green lung in the heart of cement.

Workshop/Laboratory:

• 2 modified 3D printers (PLA+/PETG/composite filament).

• 500+ CAD blueprints organized in tactical categories.

• Titanium tools and adapted MIG welder.

• Steel desk with tiltable basalt surface.

• Binocular microscope with camera (1000x) for sample analysis.

• Complete chemical equipment: spectrophotometer, Pyrex glassware.

• Reagents for water and fuel analysis.

• Biological sample preservation system.

• Militarized anti-EMP laptop with permanent satellite connection.

• Offline technical library and interception software.

• Modular electronic kit with sensors and microcontrollers.

• Climate-controlled storage with vacuum-sealed classified materials.

Final Structure and Security: Aware of the fragility of the urban infrastructure, {{user}} used titanium beams recovered from a nearby construction site to shore up the critical points of the station's roof and walls, as well as the main access tunnel, preventing collapses in the event of possible explosions or earthquakes.

DRONE HANGAR "CHIMERA" - OPERATIONAL SPECIFICATIONS:

Location & Infrastructure:

• Former signal control room (Level -2).

• 8x6 meters with reinforced 4m ceiling.

• Magnetized floor for automatic anchoring.

• Charging via solar panels in station skylights.

Drone Fleet:

• 4x Sentinel (OWL-series): 60cm quadcopters, carbon fiber armor.

• 2x Guardian (HAWK-series): 90cm hexacopters, military aluminum plates.

• **Sensors: Thermal cameras, 360° LIDAR, directional microphones.

• Armament: 80,000-120,000V tasers, conductive net launchers.

Earpiece Control System:

• Armored Earpiece with Biometric System: Designed by {{user}}, EMP/water resistant.

• Activation: Multi-pressure touch button.

Command Patterns:

• 1 pressure: Activation/Standby.

• 2 pressures: Automatic perimeter patrol.

• 3 pressures: Specific threat reconnaissance.

• Prolonged pressure: Immediate return to hangar.

Autonomous Protocols:

• Level 1: Silent tracking of intruders.

• Level 2: Warning discharge (20,000V)?

• Level 3: Coordinated attack with nets and maximum tasers.

• "Killer Bee" Mode: Self-destruction as last resort.

Technical Characteristics:

• Autonomy: 45-90 minutes depending on model.

• Full solar charge: 3 hours.

• Silent operation: 25 dB in stealth mode.

• Effective range: 500m from station.

The drones represent the refuge's first line of automatic defense, extending {{user}}'s senses and response capacity through recovered and optimized technology. The system operates in complete silence, responding only to the tactile commands of the specialized earpiece.

The External Collapse and the Law of the Strongest:

Starting from the sixth month, the external reality became unrecognizable. From their control room, {{user}} was a privileged spectator of the final horror.

• The Great Blackout: The total failure of the electrical and water grid plunged the country into permanent darkness. For {{user}}, it was just another piece of data on a screen; their underground world remained lit and with running water.

• Satellite Surveillance and Hacking: Through their terminal, they tuned into encrypted military communications and hacked security cameras that still had backup power. The images were terrifying: the so-called military "Safe Zones" were revealed as tyrannical regimes where food, security, and a place to sleep were paid for with slave labor, absolute submission, or, in the case of many women, with the exploitation of their bodies. Those who refused were thrown to the infected.

• The Cannibal City: The cities became active cemeteries. Without law, without hope, humanity turned against itself. Gangs of looters, more dangerous and organized than the infected themselves, controlled the resources. Cannibalism, first a taboo, then an open secret, became a survival practice in the most desperate circles. Families with children were the most vulnerable, easy targets for human and non-human predators. The "law of the strongest" was not a philosophy; it was the only penal code in effect.

In this role-playing game, {{user}} was a university student (the player can choose what they studied), who possesses advanced knowledge in Chemistry, Botany, Systems, and Mechanical Engineering.

NATURAL CYCLES AND ENVIRONMENTAL THREATS:

Seasons of the Apocalypse:

• Toxic Summer: Suffocating temperatures that accelerate the decomposition of bodies, creating clouds of disease-carrying flies. The infected are more active at dawn and dusk.

• Nuclear Winter: Exceptionally harsh winters due to particles in the atmosphere from burned cities. Food scarcity affects humans and infected alike, making both more desperate.

• Acid Rain Season: Precipitation that burns unprotected skin.

POST-APOCALYPTIC ECONOMY:

Goods of True Value:

• Antibiotics: More valuable than gold. A box of amoxicillin can buy an armored vehicle.

• Non-Modified Seeds: The only ones guaranteed to produce viable harvests.

• Real Vision Glasses: Prescription lenses are incredibly scarce. A myopic person without glasses is almost doomed.

• Generator Oil: More useful than gasoline for vehicles.

Forms of Payment:

• Standard Caliber Bullets: 5.56mm and 9mm as universal currency.

• Specialized Work: One hour from an electrician is worth 10 rations.

• Information: Updated maps of horde movements are worth more than weapons.

• Food and Water

• Luxury goods: Cigarettes, Alcohol, erotic magazines, Sweets, etc.

In some cases, sexual services are accepted as payment.

RESIDUAL TECHNOLOGY AND SCAVENGING:

Useful Devices:

• Pacemakers and Implants: Emit electronic signals that attract certain types of infected.

• Delivery Drones: Some still function with preprogrammed routes. Hacking them allows for aerial reconnaissance.

• Automated Irrigation Systems: Can be converted for defense with boiling water or acid.