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Cobblemon Mass OutbreaksMinecraft mod for 1.21.1

The "Cobblemon Mass Outbreaks" mod is a Cobblemon addon that introduces Mass Outbreaks.

server onlynewest supported release 1.21.1AdventureMobsGame MechanicsWorldgen
Latest version
1.0.0-1.21.1-fabric
Minecraft
1.19.2 to 1.21.1
Java
Java 21+
Loaders
Fabric, NeoForge, Forge
Licence
MIT
Downloads
217.0k
Updated
16 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Cobblemon Mass Outbreaks servers

One click and Cobblemon Mass Outbreaks is installed with the right loader, on hardware built for it.

  • 1.21.1
  • Fabric
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Cobblemon Mass Outbreaks declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Fabric, NeoForge, Forge21+declared8 Aug 2024
1.20.1Fabric, Forge, NeoForge17+declared12 Jun 2023
1.20Fabric, Forge, NeoForge17+declared2 Jun 2023
1.19.2Fabric, NeoForge, Forge17+declared5 Aug 2022

Download

From Cobblemon Mass Outbreaks’s own host. Nothing is re-hosted here.

For Minecraft 1.21.1

Choose the loader you use before downloading.

  • Fabric

    1.0.0-1.21.1-fabric · 2 Jul 2025 · cobblemonoutbreaks-fabric-1.0.0-1.21.1.jar

    Get Fabric

  • NeoForge

    1.0.1-1.21.1 · 2 Jul 2025 · cobblemonoutbreaks-neoforge-1.0.1-1.21.1.jar

    Get NeoForge

Most recently published release

1.0.0-1.21.1-fabricrelease2 Jul 2025

cobblemonoutbreaks-fabric-1.0.0-1.21.1.jar · 0.2 MB · for 1.21.1 · Fabric

Download this release
a092d846a1c4…
Older versions6
  • 1.0.1-1.21.12 Jul 20251.21.10.2 MB21.4k downloads0385a31a6140…Get
  • 1.0.0-1.21.17 Mar 20251.21.10.2 MB6.8k downloadsb4bfb628fd8c…Get
  • 1.0.623 Nov 20231.19.290 KB1.3k downloads57e3f0e03394…Get
  • fabric-1.1.4-1.20.123 Nov 20231.20.1, 1.200.1 MB77.1k downloads45926b609ca5…Get
  • 1.0.5-1.19.223 Nov 20231.19.289 KB752 downloadsc6a0b52fb291…Get
  • 1.1.4-1.20.123 Nov 20231.20.10.1 MB18.8k downloadse1d584fd7a2a…Get

Frequently asked

Does Cobblemon Mass Outbreaks work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Cobblemon Mass Outbreaks 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 Cobblemon Mass Outbreaks support?

Everything the author has declared, from 1.19.2 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Cobblemon Mass Outbreaks on the client or the server?

The server only. Players join with an ordinary Minecraft client and install nothing.

Which platform or loader does Cobblemon Mass Outbreaks support?

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

Which Java version do I need for Cobblemon Mass Outbreaks?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What licence is Cobblemon Mass Outbreaks under?

MIT, 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 Cobblemon Mass Outbreaks?

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 Cobblemon Mass Outbreaks safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

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

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!BookshelfAn open source library for other mods!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Used by

1 project lists Cobblemon Mass Outbreaks as a required dependency.

Cobblemon Outbreaks++Adds additional mass outbreaks to the Cobblemon Mass Outbreaks Mod.

Details from Modrinth, where the author last updated it on 2 Jul 2025. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .