KillTheRNG
Library for making Minecraft RNG deterministic.
About this Mod
This mod is abandoned, you should not use this
Removing Minecraft RNG in the most brutal way possible
Patches every call to JavaRandom to be deterministic.
Used as an optional dependency for TASmod and in Tool-Assisted Speedrunning to make the game deterministic.
Can be used to change RNG seeds individually, for scientific purposes.
Commands
/killtherng <RNGName> Read the current RNG seed of that value and how many times it has been called/killtherng <RNGName> <RNGSeed> Set the seed of that value./seedingmode Change how and if the RNG value should change. Can be on every tick and more.
Multiplayer
Does work on multiplayer, however a server side installation is required
Caution!
Some unintended side effects may happen when using this in your world. Use with care and play on a backup!
Available Versions
How to Install KillTheRNG on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set forge Loader
In the panel under "Egg", select the forge loader and matching Minecraft version (1.12.2).
Install Mod
Open the mod browser in the dashboard and search for "KillTheRNG". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.12.2
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
KillTheRNG server crashes on startup – what to do?
Most common cause: wrong forge 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 (1.12.2). You can switch loaders with one click in the panel.
Is KillTheRNG compatible with forge?
KillTheRNG officially supports forge for Minecraft 1.12.2. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with KillTheRNG – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if KillTheRNG 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 KillTheRNG with just one click on your server.