DatapacksJava
Rarer Heavy Core
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.
Heavy Core Drop Rate Changes
Vanilla (Default):
Heavy Cores have a 7.5% drop chance from an Ominous Vault.
On average, that means you’ll get one about every 13–14 vaults.
With My Datapack:
Heavy Cores now have a 4% drop chance.
On average, you’ll get one about every 25 vaults.
This makes Heavy Cores significantly rarer and more valuable compared to vanilla.
Quick facts
- 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 — see the MC Java Mods guides for the full walkthrough.
Verified by MCModsHub
- Downloads as Low heavy core chance.zip
- Download size: 277 KB
- Download link checked 7 Sept 2026 — working
These come from our own check of the pack file, not from the source page.