JJCSystems-Extension
by Loosebit
JJCSystems-Extension is a Forge add-on for the Systems Original Jujutsucraft Mod that adds an ocean generation, a shop points interface and a set of small gameplay utilities.
What it does
Installed next to the base mod, JJCSystems-Extension adds ocean generation to worlds and a Kogane entity. Players earn points by killing curses and other players, and spend them through a shop points screen. Most of the additions can be switched on or off with gamerules, so a server owner decides which parts a world uses.
The mod also includes an auto-random technique selector and a double jump buff, each toggleable through its own gamerule set to true or false. Together these features form a small utility layer on top of the Jujutsucraft content. The extension requires the base mod, which must be installed alongside it, and the dependency link is not yet set on the listing, so players should install both by hand.
Files are published for Forge only, for 1.20.1, with 0.1.30-1.20.1 as the latest file from 2026-04-13. Every player and the server need a copy of the mod. The code is under All rights reserved and is not open source.
Key features
Shop points interface
A shop screen lets players spend the points they collect from defeating curses and other players.
Ocean generation
The mod generates ocean terrain in new worlds, adding a biome that the base content does not place.
Gamerule-controlled features
Most additions can be enabled or disabled through gamerules, so each world can choose its own set.
Kogane entity
A custom Kogane entity is added to the game, with its own behavior tied to the point system.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who already run the Systems Original Jujutsucraft Mod on Forge 1.20.1 and want extra points, utilities and world generation on top of it. Server owners who want to tune which features apply on their server.
How it compares
JujutsuCraft Crash Fix is client and server on Forge for 1.20.1 under the MIT License and is not open source, so it targets a different problem than this add-on. Jujutsucraft Improve is server-side only on Forge for 1.20.1 under the MIT License, so clients need nothing extra. JJK BlackFlash Addon is server-side only on Forge for 1.20.1 under the Apache License 2.0.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| JJCSystems-Extension | Forge | 1.20.1 | Client and server | 2026-04-13 |
| JujutsuCraft Crash Fix | Forge | 1.20.1 | Client and server | 2026-08-24 |
| Jujutsucraft Improve | Forge | 1.20.1 | Server-side only | 2026-09-28 |
| JJK BlackFlash Addon | Forge | 1.20.1 | Server-side only | 2026-02-23 |
Questions
Does JJCSystems-Extension need the base mod?
Does the server need the mod installed?
Can server owners turn off the extra features?
In the catalog
JJCSystems-Extension is one of 7,216 Magic mods on ModsFinder, and one of 3,927 Magic mods for Forge. 34,764 mods support Minecraft 1.20.1.
Similar mods
What the author says
This mod adds small gameplay mechanics and utility features, including a point system, abilities, and a custom entity. Most features can be enabled or disabled via gamerules.
Official listing
- Modrinth page
- modrinth.com/mod/jjcsystems-extension
- Owner
- Loosebit
- Published
- 2026-04-01
- Updated on Modrinth
- 2026-04-13
- Facts verified
- 2026-10-15