How to Host The Invasion Forge Server (1.20.1 Setup Guide)
The Invasion is a Forge 1.20.1 zombie-survival pack that pairs TaCZ's realistic firearms — complete with attachments and reload animations — with invasion events and sharper mob AI, and it's picked up 32K downloads for that combat feel. Hosting it well mostly comes down to giving TaCZ's gun systems and the invasion AI enough RAM headroom and checking the pack loads cleanly before anyone logs in for a wave fight.
Start your Forge 1.20.1 server with at least 5 GB of RAM. The Invasion runs TaCZ's gun models, attachment systems, and the pack's invasion-event mob AI on top of standard Forge overhead, so anything lower risks stutter right when a zombie wave hits.
Import The Invasion from a server pack through a modpack installer rather than copying your client's mods folder. TaCZ ships client-only rendering and animation files that don't belong on the server, and a clean server-pack import keeps the gun mechanics and invasion events in sync without leftover client junk.
Watch the console through first boot until TaCZ finishes registering its weapon and attachment data and the invasion-event mob AI loads without errors. A stalled or spammy log at this stage almost always points to a missing dependency mod, not a RAM problem.
Only invite players once that first boot completes cleanly and you've confirmed TaCZ weapons spawn and fire correctly in a quick test session. Joining mid-crash-loop during a zombie wave is the fastest way to sour a PvE pack that's built entirely around combat feel.
Take a backup before importing an existing world, updating Forge, or touching TaCZ's weapon configs. A bad config reset can silently wipe gun balance or invasion-event tuning, and replaying a zombie-invasion world from scratch is exactly the kind of progress players don't want to lose.
Use a cleaner The Invasion path
CoalHost is built around modpack hosting, which makes The Invasion much less annoying to launch correctly.
Deploy The Invasion now →