CurseForge · Minecraft mod
Dea's Fission
A configurable nuclear fission reactor for GregTech CEu Modern
Quick answer
Which Dea's Fission release should I use?
Dea's Fission deafission-1.20.1-0.16.0.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. 1 required mod needs a matching file.
Where it goes
Is Dea's Fission 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 Dea's Fission deafission-1.20.1-0.16.0.jar need?
deafission-1.20.1-0.16.0.jar. Change the file and its required mods may change too.
Install GregTech CEu Modern, KubeJS, Rhino, Architectury API first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match. 3 come through another mod in the chain.
3 extra mods were pulled in by other dependencies. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Dea's Fission without breaking your instance.
Built for Dea's Fission deafission-1.20.1-0.16.0.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use deafission-1.20.1-0.16.0.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install GregTech CEu Modern, KubeJS, Rhino, Architectury API first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match. 3 come through another mod in the chain.
- 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 deafission-1.20.1-0.16.0.jar. It opens that exact file at the source.
About this project
What does Dea's Fission add?
A Minecraft Forge 1.20.1 mod that adds a nuclear fission reactor. For GregTech CEu Modern. On its own this mod doesn't do much; it is best used when included in modpacks. No support for other mod loaders or Minecraft versions is currently planned. For modpack developers there is KubeJS support; also for custom fuels. There is also support for ComputerCraft and GT's own central monitor. Try it on TerraFirmaGreg-Modern 0.11!
In this mod:
- Two different sizes for the reactor multiblock using the GT multiblock system and hatches.
- Custom renderer that reacts to the current heat level.
- Different reactor fuels which generate heat (heat generator), and depleted outputs.
- The reactor is a "heat-battery" that slowly cools down on its own.
- Coolant-based per-tick operation with fractional number support (heat usage): the reactor takes an amount of input fluid, and "heats it" outputting another fluid.
- Material holder for heat-based crafting recipes and heat-level requirements like in the EBF (heat usage).
- Heat usage and fuel damage are proportional to current heat. The more fuel rods, the higher the max heat and worse the efficiency.
- Customizable reactor insides and stat-affecting component system (such as max heat capacity without overheating).
- Redstone output (heat and installed fuel).
- ComputerCraft and Central Monitor support.
- KubeJS support and examples (Recipes. New fuel rods. Components partially).
Thank you for choosing Dea (aka Vazde)! We hope you are happy with your newly 'purchased' nuclear fission reactor blueprints! The reactor represents weeks worth of cutting edge nuclear research, packaged in a neat GregTech CEu-Modern multiblock you can customize to your heart's (and blueprint's) desire! HAYO!
The fission reactor has three purposes!
- The nuclear reaction splits atoms to less heavy ones, producing rare elements from very affordable input elements. Think of all the possibilities!
- It produces heat. A lot of it. This can be used to convert coolant fluids to hotter fluids. For example water to steam. Or special coolant fluids to hot variants, which can be used to run high-power turbines. Who needs dirty coal! Or some smelly nitrated hydrocarbons. HAYO!
- The immense heat can be used to replace the energy-hungry Electronic Blast Furnace (EBF).
The operating principle of the reactor is as follows: each tick the installed fuel pellets in the reactor produce heat: the more pellets, the more heat. And the more heat, the more violent the reactions are, so the fuel gets used up faster! Depending on the goal given by your executives, this can be either a good or a bad thing - high heat produces new elements faster. If you on the other hand need to maximize your fuel efficiency and generate as much hot coolants as possible with little fuel, it's best to operate at a lower heat. We know it makes no sense. !OYAH
Please note that the universe of Minecraft is a strange place, and depending on in which galaxy (modpack) the reactor is installed in, it may operate wildly differently than described above. There's this certain spacetime anomaly "curve" - referred to in the holy scriptures as fi.dea.mc.deafission.core.ReactorCurve - which makes that happen. To go above and beyond the call of duty, a distinghuished engineer will study the scriptures to find the best possible reactor design. Just do it. It's not rocket science, after all!
Permission is granted to include this mod in modpacks, to make derivatives of the ReactorCurve for modpack purposes, and to reproduce and edit the code for mixin purposes. The code should be relatively well documented :)
Acknowledgements: This mod has been designed in collaboration with TerraFirmaGreg-Modern developers. I wish to thank for their insight. And thanks Tom for building a whole voltage tier worth of production chains in the modpack for this.
Project description from CurseForge.
Pick your setup
Dea's Fission by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.20.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Dea's Fission versions and loaders
deafission-1.20.1-0.16.0.jar
16 Feb 2026
deafission-1.20.1-0.15.4.jar
7 Dec 2025
deafission-1.20.1-0.15.2.jar
24 Nov 2025
deafission-1.20.1-0.15.1.jar
24 Nov 2025
deafission-1.20.1-0.15.0.jar
22 Nov 2025
deafission-1.20.1-0.14.0.jar
3 Nov 2025
deafission-1.20.1-0.13.3.jar
1 Nov 2025
deafission-1.20.1-0.13.2.jar
30 Oct 2025
deafission-1.20.1-0.13.1.jar
28 Oct 2025
deafission-1.20.1-0.13.0.jar
23 Oct 2025
deafission-1.20.1-0.12.0.jar
16 Oct 2025
deafission-1.20.1-0.11.2.jar
15 Oct 2025
Looking for an older file? The official CurseForge project page is in Resources.