Rarer Heavy Core
Heavy core is already one of the rarest items in the game, but this datapack makes it even rarer
About this Mod
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.
Available Versions
How to Install Rarer Heavy Core on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set datapack Loader
In the panel under "Egg", select the datapack loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "Rarer Heavy Core". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.9 (+9 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Rarer Heavy Core server crashes on startup – what to do?
Most common cause: wrong datapack version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is Rarer Heavy Core compatible with datapack and fabric and forge and neoforge and quilt?
Rarer Heavy Core officially supports datapack, fabric, forge, neoforge, quilt for Minecraft 1.21.11, 1.21.10, 1.21.9. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Rarer Heavy Core – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Rarer Heavy Core consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Rent Modded Server
Install Rarer Heavy Core with just one click on your server.