Source-checkedQuality of life & UI

Eternal Upgrade

by Parcew · for Core Keeper

Unlock level 21 upgrades for your weapons, armors or tools and make them with infinite durability.

4.8KDownloads
36d agoLast updated
1.2.1.5Latest game version
mod.ioSource

About Eternal Upgrade

From mod.io

Unlock 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 data

Game 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 catalog
Listed on mod.io as “Quality of Life”

Quality of life & UI

Small conveniences, tweaks and interface improvements players notice straight away.

Runs on your server

From source side support

mod.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

Eternal Upgrade, answered

Generated from the mod’s own source data.

Do my players need to install Eternal Upgrade?

mod.io lists Eternal Upgrade as required on the server. Check its mod.io page to see whether players need it too.

Is it free?

Yes. Eternal Upgrade is free to download from mod.io.

How do I add it to my Nxeon server?

Use “Add to a server” on this page, or open NxLabs from your dashboard. We install it, restart your server and switch it on.

NxLabs

Run Eternal Upgrade on a Core Keeper server.

Deploy in about a minute from $4.99 a month, then add Eternal Upgrade in one click.