This mod fixes critical crashes in Celestial 2.0 for NeoForge 1.21, allowing Forge/NeoForge users to enjoy the full sky customization features of Celestial.
What This Fixes Celestial 2.0 for NeoForge crashes on startup due to incompatible mixin refmap mappings. The original mod's refmap uses Fabric/Yarn intermediary mappings (field_20898, field_21327, field_21328, etc.), but NeoForge requires Mojang mappings (poseStack, pose, normal, etc.).
Without this fix, you'll encounter:
- Immediate crashes when launching with Celestial 2.0 on NeoForge
- Mixin application failures referencing missing field mappings
- Inability to use Celestial's sky customization features on Forge-based modpacks
- With this fix, Celestial 2.0 works seamlessly on NeoForge 1.21, enabling:
- Custom planets and stars in the sky
- Sky and fog color customization
- Custom skyboxes and animated skies
- Resource pack-based configuration (no config files needed)
- Full compatibility with vanilla and modded dimensions
Technical Details This fix patches Celestial-common-refmap.json by adding the searge section with correct Mojang mapping names, ensuring mixin transformations apply correctly to NeoForge's obfuscated classes. No gameplay code was modified—only the mapping references needed for NeoForge compatibility.
Compatibility
- Minecraft Version: 1.21
- Mod Loader: NeoForge
- Fixed Version: Celestial 2.0
Installation Simply add this mod to your mods folder. Remove the original broken celestial_1.21_neoforge-2.0.jar if present.
About This Fork This is a compatibility patch for Celestial by fishcute. The original author permits reuploads and fixes. This project exists solely to provide NeoForge users with a working version until an official update is released.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21, 1.21.1, 1.21.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as celestial_1.21_neoforge-2.0.jar — drop this file into the mods folder
- Download size: 198 KB
- Download link checked 25 Sept 2026 — working
These come from our own check of the pack file, not from the source page.