About Eternal Upgrade
From mod.ioUnlock level 21 upgrades for your weapons, armors or tools and make them with infinite durability.
Eternal Upgrade
Eternal Upgrade pushes your weapons, armors or tools one final step beyond their natural limit. Upgrade to level 21 for triple the cost plus rare gems, and your weapon becomes permanently indestructible.
The Upgrade Station can be crafted at the Scarlet workbench.
Works on Core Keeper 1.3+, multiplayer and dedicated servers.
FEATURES
Eternal Upgrade adds one final, secret upgrade tier to every weapon, armor and tools in the game. When you reach level 20, the upgrade station offers you a level 21 that changes everything.
The cost triples and you'll also need three rare gems: Nature, Sea, and Desert. Only the most prepared adventurers can forge an eternal weapon, armor or tool but the reward is a weapon, armor or tool that never loses durability again.
The station preview shows exactly what you'll get: the normal stats for level 21, but the durability line is replaced by a green "Eternal" label, so there's no confusion about what you're about to create.
⚠️ If you ever decide to remove the mod, just type eternalupgrade/downgrade in the console (Ctrl + X) while you have your weapons, armors or tools in your inventory. All your level 21 items safely return to level 20.
HOW IT WORKS
- Upgrade any weapon, armor or tool to level 20 as usual.
- Place it in the upgrade station; the preview will show level 21 with triple the normal materials plus 5 Nature, Sea, and Desert gems required.
- Once you have everything, press the upgrade button.
- Your weapon, armor or tool jumps to level 21, becomes permanently indestructible, and the durability text changes to a green “Eternal”.
- If you later want to revert your items, open the console with Ctrl + X and type eternalupgrade/downgrade, all your level 21 gear returns safely to level 20.
CREDITS
Created by Parcew
Mod idea by dianne
Special thanks to the Core Keeper modding community.
FEEDBACK & SUPPORT
Discord: @parcew (preferred)
You can also leave a comment on the mod page.
LINKS
Modding guide: https://modding.corekeepergame.com/
My other mods: https://mod.io/u/parcew/
Support my work: https://ko-fi.com/parcew
LICENSE
This mod is protected by the Parcew Mod License. Re-uploading, redistributing, or including this mod (or any of its files, assets, prefabs, or other original content) in other mods or packs without written permission is not allowed.
Full license: https://github.com/parcew/modding/blob/main/LICENSE.md
Permission requests: Discord parcew
This mod is not affiliated with or endorsed by Pugstorm.
Highlights
From source dataGame versions
Built for Core Keeper 1.2.1.5.
Footprint
Rated a light load on a server.
Last update
Its author last shipped an update 36d ago.
Eternal Upgrade on Nxeon
From our catalogue- One-click install
- Supported on Nxeon Core Keeper servers. We download it from mod.io, place it, and restart the server.
- Server side
- Required on the server
- Server load
- light
- Smallest plan we suggest
- Core Keeper — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
- Latest build
- 1.0.5, released 2026-09-29
Run Eternal Upgrade on a Core Keeper server
Pick a server or deploy a new one above; it is installed in one click.
What kind of mod it is
From the catalogQuality of life & UI
Small conveniences, tweaks and interface improvements players notice straight away.
Runs on your server
From source side supportmod.io lists Eternal Upgrade as required on the server. Check its mod.io page to see whether players need it too.
Compatibility
- Game
- Core Keeper
- Runs on
- Serverrequired on the server
- Game versions
- 1.2.1.5
Verified at the source
- ✓mod.ioOfficial listing, checked 2026-10-20Open ↗
- ✓AuthorParcew, as published on mod.io
- ✓LicenseNot published by the sourceFree








