How to Host a Demon Slayer (Kimetsu no Yaiba) Modpack Server

Start with at least 6 GB of RAM allocated — that's the floor the Kimetsu no Yaiba (Demon Slayer) ModPack itself recommends on Forge 1.20.1. Breathing-style combat, demon transformation mechanics, and the Demon Slayer Corps progression systems all run on top of vanilla Forge overhead, so under-allocating here is the single fastest way to end up with tick lag once a few players are breathing in sync.

Import the modpack from its official Forge release rather than guessing at the mod list from a client export — pick the pack from CoalHost's modpack list and let the installer pull the matching server-side files so the Forge version, mod versions, and configs line up exactly with what your players' launchers expect.

Watch the console through the first boot and let it finish completely before touching anything. Forge 1.20.1 has to register every breathing-style ability, demon transformation state, and Corps-rank quest trigger on startup — a pack this size can take several minutes on first launch, and killing it early is a common cause of corrupted mod data.

Only invite players once that first boot has completed cleanly with no repeating errors in the log. A server that looks "up" mid-boot will still reject or desync anyone who tries to breathe-dash or trigger a demon transformation before the registries finish loading.

Take a backup before importing a world, updating the Forge loader, or editing any breathing-style or Corps-progression configs. Players invest real time grinding toward Hashira-tier breathing mastery and Demon Slayer Corps rank — losing that to an unbacked config change or a bad update is the kind of mistake that ends a server's playerbase.