Scarcity — where it starts
The premise everything rests on: ores are scarce and regional, so no one area has everything. Where you settle decides what you can make and what you have to trade for.
Ishimura · Minecraft 1.21.1 · NeoForge
Project Commonwealth
Magna Communitas
A cooperative Create pack for a small crew, built around Create Aeronautics. Ores are scarce and regional, so nobody builds everything alone — you specialize, trade, and fly your airships off the edge of the world together.
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01 How to join
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Install Prism Launcher
Grab Prism Launcher (free, open-source, Windows/Mac/Linux). You'll need a Minecraft account and Java 21, which Prism offers to download for you if it's missing.
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Download the pack
Grab the Project Commonwealth pack file (~5 MB). One small zip, no account or store needed.
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Import into Prism
Add Instance → Import from zip → Browse to the file → OK. It unpacks small, with no mod jars yet; those come on first launch.
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Launch once to download mods
Hit Launch. The first run pauses a minute or two while it fetches every mod (the Prism log shows progress). Later launches are instant. The instance ships pre-tuned at 8 GB min / 12 GB max. Lower the max under Edit → Settings → Java if you have less than 12 GB, but never below 4 GB.
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Connect
Multiplayer → Add Server, then paste the address:
pcmc.ishimura.xyz
02 The pack
- Minecraft
- 1.21.1
- Mod loader
- NeoForge 21.1.233
- RAM
- 8–12 GB
- Disk
- ~12 GB free
One loop, not a checklist
It's broad on purpose — food, magic, colonies, mobs, vehicles — but it isn't a random heap. It runs as one loop: ores are scarce and regional and the world pushes back, so you produce what you can — and because no one can make everything, an economy grows up to trade the rest between players. You specialize in what you're good at and depend on the others for the rest.
Create — the tech spine
The rotational-engineering core everything else bolts onto: Big Cannons, Create Nuclear, TaCZ firearms gated behind Create parts, and dozens of add-ons for factories, logistics and jetpacks.
Magic — the other way to make things
Three magic mods bridged into one progression — Ars Nouveau, Iron's Spells 'n Spellbooks and Occultism — with Modular Golems and Grimoire of Gaia alongside. A second production route parallel to Create, not just flavor.
Survival — the world pushes back
What you farm and where you settle matter through the year: Serene Seasons, Cold Sweat temperature and a five-group Diet reward variety. And it's dangerous to explore — Alex's and Mowzie's Mobs, perilous structures, and bosses worth gearing up for.
Economy — moving goods, and the airships
Where specializing pays off. Numismatics currency, Create: Trading Floor and bounties give your surplus a buyer; MineColonies towns are an alternate way to produce. And the flagship: Create Aeronautics airships and planes plus Steam 'n' Rails trains are how goods — and players — cross the map.
…and a fuller, deadlier world
Around the loop: L_Ender's Cataclysm bosses (whose drops unlock late-game tech), Farmer's Delight and the Let's Do series, TownTalk villagers, plus Terralith, YUNG's dungeons and stacks of building blocks.
By design, complex Create tech unlocks through colony progress and boss drops, not a tech-tree grind. It's pre-alpha and stays fresh through curated updates rather than world wipes, so the installer always pulls the current set and auto-syncs each launch.
03 Get the pack
One small file (~5 MB). Import it into Prism and the launcher pulls every mod on first launch, so there's no giant download, and it auto-syncs each time a new version ships.
Download for Prism →Recent versions
04 Rules
Rules are being written. zagwar is designing how players claim land, trade, and interact. Check back soon, or ask in the Discord in the meantime.
05 FAQ
It won't launch or it crashes on world load.
Most of the time it's too little RAM or a half-finished first download. Make sure Java 21 is installed, give the instance 8 GB, and let the first launch finish fetching mods. Still stuck? Open .minecraft/logs/latest.log, find the Caused by line, and drop the log in the Discord.
My airship looks broken with shaders on.
A known upstream bug with Iris/Oculus shaders: they render Aeronautics ships wrong. Turn shaders off when flying.
A mod misbehaves while I'm on a moving ship.
The compat layer is meant to handle exactly that. If a specific mod is still wrong on a contraption, mention which one in the Discord so it can be flagged.
Can I add my own mods?
Client-only cosmetic mods are usually fine. Anything touching world content or networking will desync you from the server, so ask first.
How do I report a bug or request a mod?
Post in the Discord. That's the fastest way to reach the people who run the pack, and you don't need an account anywhere else.
Who makes the pack, and how?
Project Commonwealth is maintained by two people. To make that workable, a lot of the repetitive work — manifest wrangling, recipe-graph analysis, config bookkeeping, release tooling — is handled with LLM assistance. The decisions are ours: what's scarce, what stays, what gets cut, how the systems fit together. The tooling is how we keep a pack this broad coherent without a full team behind it. We don't use AI to generate art, textures, or music; every asset is the work of the mod authors we build on.