How to Host a Spellnomia Server (Forge 1.20.1 Setup Guide)

Start with 5 GB of RAM as your floor, not a guess from a generic Forge checklist. Spellnomia's own recommended allocation sits at 5 GB because of the constant spell-particle load from Iron's Spells 'n Spellbooks, mana regeneration ticking on every player, and the extra entity load during dragon and boss fights. Go lower and you'll see stutters the moment more than one player starts casting.

Import the modpack cleanly instead of reconstructing it from a client export. A client-side .minecraft folder carries client-only resource packs, keybinds, and leftover configs that don't belong on a server and can quietly break Iron's Spells 'n Spellbooks' server-side spell registration. Use a proper server-pack install so you get the exact mod list Spellnomia ships with.

Watch the first boot all the way through. Forge needs to load every mod, Iron's Spells 'n Spellbooks needs to register its spell and class data, and any grimoire or loot-table additions need to finish building before the world is actually ready. Don't call it "done" until the console goes quiet with no repeated errors.

Only invite players after that first clean startup has finished. Letting people connect mid-load is how you get missing spellbooks, half-registered classes, or players spawning before mana and class progression systems have initialized — not actual bugs, just a server that wasn't ready yet.

Back up before you import a world, update the Forge loader, or touch configs. Spellnomia characters carry wizard, mage, and arcane class progression plus unlocked spells and grimoires — all of that lives in save data that a bad update or a careless config edit can wipe out in seconds.