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Celestial Unofficial 2.0 Fix

by EnVyOnMyMind

Celestial Unofficial 2.0 Fix is a NeoForge patch for the Celestial 2.0 sky customization mod, which lets Forge-based modpacks use the sky features that crash without it.

NeoForgeClient and serverMIT LicenseOpen source1.21 – 1.21.11

What it does

The fix addresses a crash in Celestial 2.0 and mixin failures that reference missing field mappings. It patches the Celestial-common-refmap.json file with a searge section that uses the correct Mojang mapping names, so mixin transformations apply to NeoForge's obfuscated classes. No gameplay code is modified; only the mapping references change.

Celestial itself adds custom planets, sky fog color settings, and animated skyboxes. These are configured through resource pack files rather than a graphical menu. With the patch in place, Celestial 2.0 runs on NeoForge 1.21 and later, and it is needed on both client and server, since the environment is client and server.

Builds cover 1.21 – 1.21.11 across 12 release versions, and the latest NeoForge file, 2.0 for 1.21.11, was published on 2026-02-07. The code is open source under the MIT License.

Key features

  1. Crash fix for Celestial 2.0

    Resolves a startup crash that Celestial 2.0 causes when loaded on NeoForge.

  2. Mixin mapping correction

    Adds a searge section to the refmap file so mixins resolve the correct Mojang mapping names.

  3. Custom planets and skies

    Enables Celestial's custom planets and sky configuration in NeoForge modpacks.

  4. Sky fog and skyboxes

    Keeps Celestial's sky fog color settings and animated skyboxes working after the patch.

Compatibility

Latest build for each game version and loader.

1.21.x12 of 12 versions with builds
1.21.112.0
1.21.102.0
1.21.92.0
1.21.82.0
1.21.72.0
1.21.62.0
1.21.52.0
1.21.42.0
1.21.32.0
1.21.22.0
1.21.12.0
1.212.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Modpacks with Celestial

Pack builders who want Celestial's sky features in a NeoForge pack can add this fix so the mixins apply without errors.

Who it’s for: Modpack creators and server owners running Celestial 2.0 on NeoForge who see mixin errors or crashes related to missing field mappings.

Questions

Does Celestial Unofficial 2.0 Fix need to be installed with Celestial 2.0?

Yes. The fix patches Celestial 2.0's refmap file, so it must be installed alongside the Celestial 2.0 mod on NeoForge.

Does the fix have to be installed on both sides?

Yes. The server and every player need the mod installed.

Which Minecraft versions does the fix support?

Files exist for 1.21 – 1.21.11, with 2.0 for 1.21.11 as the latest NeoForge file, published 2026-02-07.

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What the author says

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…
EnVyOnMyMind, on the Modrinth page

Official listing

Owner
EnVyOnMyMind
Published
2026-02-07
Updated on Modrinth
2026-02-07
Facts verified
2026-10-15
Open on ModrinthCompare