
THE COMPLETE ALIEN INVASION GAMEMASTER’S TOOLKIT
On Quisicosas since 9 December 2025
Featured in the newsletter of
9 December 2025 (on Substack)
What it is about
They didn’t just arrive. They occupied.
This toolkit gives you everything you need to run fast, brutal, and cinematic campaigns in a city under alien rule—using any modern, cyberpunk, or sci‑fi RPG system.
Packed with hundreds of d20 tables, this book lets you build a full invasion on the fly: from the nature of the invaders and their war machine, to the shattered streets, desperate survivors, and impossible missions that define life under occupation.
Use it to prep a full campaign in minutes, improvise entire sessions, or drop in individual tables as inspiration for your existing game.
What’s Inside
Module 1 – Alien Species Profile
Create your invaders in a few rolls:
Primary alien species and archetype
Invasion motives and goals
Communication methods and culture
Command structure, weaknesses, and hidden truths
Build anything from parasitic hive minds and crystalline overminds to misguided “galactic administrators” enforcing cosmic law.
Module 2 – Alien War Machine
Detail the tools of conquest:
Signature technologies and superweapons
Motherships and orbital assets
Standard ground units and battlefield roles
Command hierarchies and occupation strategies
Perfect for designing set‑piece battles, resistance raids, and terrifying reveals of what the aliens can really do.
Module 3 – Invasion Assets
Turn the planet into a warzone:
Mothership archetypes and orbital structures
Standard alien weapons and battlefield gear
Experiments on humanity and hybrid projects
Official propaganda, broadcasts, and “mercy offers”
Use these tables to show how the invasion reshapes everyday life and what the occupiers truly want from humanity.
Module 4 – Urban Characters & NPCs
Populate your ruined city with memorable people:
Survivor archetypes, collaborators, fanatics, and renegades
Physical appearance, personality traits, secrets, and motivations
Relationships to the PCs and what they want from them
What they can offer in return—and what complications they bring
Instantly generate rich NPCs who feel like they’ve been living under the invasion for years.
Module 5 – City Districts & Locations
Turn any map into a living, suffering city:
District types, conditions, and who controls them
Security levels, atmospheres, and street encounters
Notable locations, ambient details, and district secrets
Great for sandbox play: roll up a district, drop the PCs in, and watch the story explode.
Module 6 – Technology & Alienware
Blend human ingenuity with alien horror:
Improvised resistance weapons and gear
Exotic alien weapons, devices, and stolen tech
Human experimental prototypes and bio‑enhancements
Side effects, malfunctions, and how this tech was acquired
Ideal for groups who love tinkering, hacking, and paying the price for using things they don’t fully understand.
Module 7 – Netrunning & Digital Warfare
For cyberpunk‑flavoured invasions and data‑driven resistance:
Target systems, security ratings, and ICE types
Hacking objectives, virtual environments, and complications
Alert levels, responses, data value, and intrusion consequences
Run tense digital heists alongside street‑level action without needing a separate ruleset.
Module 8 – Missions & Jobs
Build entire campaigns around the resistance:
Mission types, employers, targets, and locations
Time pressure, opposition, complications, and twists
Entry and extraction methods, collateral damage, and aftermath
From desperate extractions and sabotage runs to political deals and false‑flag operations, you’ll never run out of hooks.
Module 9 – Factions & Gangs
Map the fractured human (and alien) power structure:
Resistance cells, collaborator regimes, cults, gangs, and more
Strengths, weaknesses, resources, and current situations
Goals, rituals, and their relationship with the PCs
Turn the city into a web of alliances and betrayals where every favour has a cost.
Module 10 – Random Tables & Urban Dressing
Bring the occupied city to life at the table:
Names, callsigns, and street nicknames
Weather, sounds, smells, and visual details
Street encounters, rumours, found items, and lucky breaks
Quick complications and scene‑level twists
Perfect for improvisation and for giving every session a distinct, cinematic feel.
System & Format
System‑neutral: Written without stats so you can plug it into any modern, cyberpunk, horror, or sci‑fi RPG.
Urban‑focused: Designed for campaigns set in cities under alien occupation.
Table‑driven: Around 90 d20 tables for maximum replay value and zero‑prep sessions.
Print‑friendly: Layout designed to work in both colour (neon alien glow) and black‑and‑white.
Use This Toolkit To
Launch a full alien invasion campaign in a single evening.
Salvage a stalled game with fresh missions, factions, and twists.
Improvise entire sessions with nothing but a handful of dice.
Drop an invasion arc into an existing cyberpunk or modern setting.
If you want your players to feel the weight of occupation, the terror of orbital fire, and the fragile hope of resistance fighters on the edge of extinction,
THE COMPLETE ALIEN INVASION GAMEMASTER’S TOOLKIT gives you everything you need, and this one is FREE.
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