How to Host a Beyond Cosmo Server (Forge 1.20.1 Setup Guide)
Beyond Cosmo is a sci-fi modpack built on Forge 1.20.1 that trades fantasy bosses and magic for high-tech guns, space exploration, and industrial warfare — it's the catalog's only hard sci-fi and space-themed pack, with no dragons, dungeons, or spellbooks anywhere in it. Hosting it cleanly comes down to three things: starting with enough RAM, importing the official pack instead of guessing from a client export, and confirming a fully clean first boot before anyone connects.
Start at 8GB of RAM, not a generic Forge guess. Beyond Cosmo's own recommended floor is 8GB — that's the number to allocate from day one, before you worry about tuning Java flags or trimming mods.
Import the official Beyond Cosmo pack through a proper modpack installer instead of zipping up a client's mods folder and guessing at versions. A clean CurseForge/Modrinth import keeps the loader version, mod versions, and configs matched to what the pack actually ships.
Watch the startup logs through a full first boot before touching anything else. Beyond Cosmo pulls in weapon mods, industrial machinery, and custom space dimensions — confirm every mod initializes, dimension registration for the planets completes, and there are no missing-dependency crashes before you move on.
Only open the server to players after that first boot finishes clean. If the world and dimensions generated without errors and the server stays up past the initial load, it's safe to send out the connection details.
Take a backup before any world import, loader update, or config change. Beyond Cosmo progress — rockets built, factories wired up, planets explored — lives entirely in that save, and a bad update with no backup means redoing all of it.
Use a cleaner Beyond Cosmo path
CoalHost is built around modpack hosting, which makes Beyond Cosmo much less annoying to launch correctly.
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