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Caelus APIMinecraft mod for 1.21.5

A coremod and API to provide developers access to elytra flight mechanics through an entity attribute.

client and servernewest supported 1.21.5Game MechanicsLibraryTransportation
Latest version
8.0.1+1.21.4
Minecraft
1.13.2 to 1.21.5
Java
Java 21+
Loaders
NeoForge, Forge, Fabric
Licence
LGPL-3.0-or-later
Downloads
6.6M
Updated
14 mo ago
Available on
Modrinth
Space NodePartner

Host Caelus API servers

One click and Caelus API is installed with the right loader, on hardware built for it.

  • 1.21.5
  • NeoForge
  • Forge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Caelus API declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.5NeoForge, Forge, Fabric21+declared25 Mar 2025
1.21.4Fabric, NeoForge, Forge21+declared3 Dec 2024
1.21.1Forge, NeoForge, Fabric21+declared8 Aug 2024
1.21Forge, NeoForge, Fabric21+declared13 Jun 2024
1.20.6Forge, NeoForge, Fabric21+declared29 Apr 2024
1.20.4NeoForge, Forge, Fabric17+declared7 Dec 2023
1.20.2NeoForge, Forge, Fabric17+declared20 Sept 2023
1.20.1Fabric, NeoForge, Forge17+declared12 Jun 2023
1.20Forge, NeoForge, Fabric17+declared2 Jun 2023
1.19.4Forge, NeoForge, Fabric17+declared14 Mar 2023
1.19.3NeoForge, Fabric, Forge17+declared7 Dec 2022
1.19.2Forge, Fabric, NeoForge17+declared5 Aug 2022
1.19.1NeoForge, Forge, Fabric17+declared27 Jul 2022
1.19Fabric, NeoForge, Forge17+declared7 Jun 2022
1.18.2Forge, NeoForge, Fabric17+declared28 Feb 2022
1.18.1Forge, NeoForge, Fabric17+declared10 Dec 2021
1.18Forge, NeoForge, Fabric17+declared30 Nov 2021
1.17.1Forge, NeoForge, Fabric16+declared6 Jul 2021
1.16.5Forge, NeoForge, Fabric8+declared14 Jan 2021
1.16.4Forge, NeoForge, Fabric8+declared29 Oct 2020
1.15.2Forge, NeoForge, Fabric8+declared17 Jan 2020
1.14.4Forge, NeoForge, Fabric8+declared19 Jul 2019
1.13.2Forge, NeoForge, Fabric8+declared22 Oct 2018

Download

From Caelus API’s own host. Nothing is re-hosted here.

8.0.1+1.21.4release23 Jul 2025

caelus-neoforge-8.0.1+1.21.4.jar · 0.0 MB · for 1.21.4, 1.21.5

Download latest
e4011ff6a460…
Older versions23
  • 8.0.0+1.21.421 Jun 20251.21.4, 1.21.50.0 MB1.5k downloadsf47944f473a6…Get
  • 7.0.1+1.21.15 Sept 20241.21, 1.21.10.0 MB13.1k downloads3763f95304ad…Get
  • 7.0.0+1.2119 Jun 20241.210.0 MB1.3k downloads22c323054ed3…Get
  • 6.0.0+1.20.67 May 20241.20.60.0 MB4.0k downloads1f7bda8c8d2b…Get
  • 5.1.0+1.20.422 Apr 20241.20.40.0 MB8.2k downloadsd8a2f9a4bd1e…Get
  • 3.2.0+1.20.122 Apr 20241.20, 1.20.10.0 MB4.1M downloads906baad404c3…Get
  • 5.0.1+1.20.45 Mar 20241.20.40.0 MB814 downloads36d74e6e36d6…Get
  • 5.0.0+1.20.419 Dec 20231.20.40.0 MB855 downloadsd5ea94da8f52…Get
  • 4.0.0+1.20.220 Oct 20231.20.20.0 MB2.6k downloadse71ed0c602ef…Get
  • 3.1.0+1.2012 Jun 20231.20, 1.20.10.0 MB431.4k downloadsb665292cf808…Get
  • 1.19.4-3.0.0.1017 Mar 20231.19.3, 1.19.40.0 MB9.4k downloads8a90fe0cb0f4…Get
  • 1.19.3-3.0.0.917 Mar 20231.19.30.0 MB414 downloads61acc4f6cfd9…Get
  • 1.19.3-3.0.0.817 Mar 20231.19.30.0 MB375 downloads93dd8e483045…Get
  • 1.19.3-3.0.0.73 Feb 20231.19.30.0 MB466 downloadsbb8bd0689287…Get
  • 1.19.2-3.0.0.63 Feb 20231.19, 1.19.1, 1.19.20.0 MB680.6k downloads11141abfb145…Get
  • 1.18.1-3.0.0.23 Feb 20231.18, 1.18.1, 1.18.20.0 MB270.6k downloads1992be966193…Get
  • 0.0.18-1.17.13 Feb 20231.17.10.1 MB1.6k downloads3b7bcb9e8657…Get
  • 1.17.1-3.0.0.23 Feb 20231.17.10.0 MB1.6k downloads5c896b85750d…Get
  • 0.0.15-1.16.43 Feb 20231.16.4, 1.16.50.1 MB3.7k downloads4e9e91e8542c…Get
  • 1.16.5-2.1.3.23 Feb 20231.16.50.0 MB71.2k downloadsee8e06ca004f…Get
  • FORGE-1.15.2-2.0-beta43 Feb 20231.15.20.0 MB1.6k downloads6ed111030dfa…Get
  • FORGE-1.14.4-1.0.1.23 Feb 20231.14.40.0 MB1.4k downloads47ecfe647950…Get
  • 1.13.2-0.53 Feb 20231.13.20.0 MB1.4k downloadsfa753ab86d75…Get

Frequently asked

Does Caelus API work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version Caelus API declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Caelus API support?

Everything the author has declared, from 1.13.2 up to 1.21.5. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Caelus API on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which loader does Caelus API need?

NeoForge, Forge, Fabric. A build for one loader will not load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Caelus API?

Java 21 or newer, because that is what the newest Minecraft release it supports requires. The requirement comes from the game rather than from the mod itself.

What licence is Caelus API under?

LGPL-3.0-or-later, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Caelus API?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Caelus API safely?

From the author's own page on Modrinth, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Last checked 2 mo ago against Modrinth. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .