ModsJava
Oops! All mobs.
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
Mod Description
The dimensions have collapsed... and the Overworld will never be the same.
The barriers between realms are gone. The Nether’s flames and the End’s void have spilled into your once-safe world. Nowhere is safe.
Features:
- Ghasts, magma cubes, wither skeletons, hoglins, piglins, piglin brutes, endermites, shulkers, blazes and striders all spawn in the overworld now.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.1, 1.21.2, 1.21.3
- 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.
Verified by MCModsHub
- Ships as oopsallmobs-1.0.0-neoforge-1.21.1.jar — drop this file into the mods folder
- Download size: 8 KB
- Download link checked 8 Sept 2026 — working
These come from our own check of the pack file, not from the source page.