CurseForge · Minecraft mod
Psi
Psi is a mod about spell programming, inspired by Mahouka
Quick answer
Which Psi release should I use?
Psi-1.21.1-108.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 1 required mods have matching files.
Where it goes
Is Psi required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Psi-1.21.1-108.jar need?
Psi-1.21.1-108.jar. Change the file and its required mods may change too.
Install Patchouli first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Psi without breaking your instance.
Built for Psi-1.21.1-108.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use Psi-1.21.1-108.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Patchouli first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside Psi-1.21.1-108.jar. It opens that exact file at the source.
About this project
What does Psi add?
About
Warning: Psi Requires Patchouli for 1.16.5 and more recent versions. Older versions require AutoRegLib
Psi is a magical tech spell programming mod inspired by Mahouka Kokou no Rettousei. Don't worry if that doesn't make any sense.
The core of Psi is a system where you can create action sequences ("Spells") to be executed in the world. This system is followed by a leveling system containing ingame documentation and tutorials of the various concepts and pieces you'll get. The mod makes use of basic mathematical concepts, such as Vectors in its systems, which allows for great flexibility on what spells can do.
Psi spells can be shared and copied to and from outside sources, using ingame sharing tools. The main repository for user made psi spells is the Psi Spell Compendium on reddit.
Psi...
- Is very flexible on what it allows you to do;
- Encourages creativity and problem solving;
- Ties in the reward to the creation process;
- Can do some pretty cool stuff.
Learn more about Psi today
Visit the Official Website
Project description from CurseForge.
Pick your setup
Psi by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
2 loader builds1.20.1
1 loader build1.19.4
1 loader build1.19.3
1 loader build1.19.2
1 loader build1.18.2
1 loader build1.16.5
1 loader build1.16.4
2 loader builds1.16.3
2 loader builds1.15.2
2 loader builds1.12.2
2 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Psi versions and loaders
Psi-1.21.1-108.jar
22 Feb 2026
Psi-1.21.1-107.jar
7 Dec 2025
Psi-1.21.1-106.jar
7 Dec 2025
Psi-1.21.1-105.jar
26 Jul 2025
Psi-1.21.1-104.jar
30 Jun 2025
Psi-1.21.1-103.jar
29 Jun 2025
Psi-1.20.1-102.jar
27 Apr 2025
Psi-1.19-101.jar
12 Dec 2023
Psi-1.19-100.jar
11 Dec 2023
Psi-1.19-99.jar
9 Dec 2023
Psi 1.18.2-98.jar
7 Apr 2023
Psi-1.16-97.474.jar
25 Mar 2023
Looking for an older file? The official CurseForge project page is in Resources.








