DatapacksJava
Update 1.21 without trial chambers
Java data pack listed for Minecraft 1.20. Downloads from the MC Java Mods app on Android.
Enables the crafter, copper and tuff blocks, without the trial chambers and breeze. Made for Hermitcraft season 10!
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.
Update 1.21 without trial chambers
Enables the Update 1.21 experimental features, but disables the trial chambers and breeze. Notably, in 1.20.5+ the new raid mechanics will also be enabled, with pillagers dropping ominous bottles instead of giving bad omen.
| Enabled | Disabled |
 Crafter
  Copper bulb
  Copper blocks
   Tuff blocks
 New raid mechanics
|
 Trial chambers
  Trial spawner and vault
 Heavy core
 Breeze
 Bogged
 Trial key
 Wind charge
|
|---|
Data pack instructions
After installation, DON'T enable the separate "update_1_21 (feature)" data pack!
Adding to a new singleplayer world- Open the "Data Packs" selection screen when creating a new world
- Drag the downloaded datapack zip file onto the game window
- Move data pack to the "Selected" column and click "Done"
- Accept the "Experimental Features Warning"
- Change any other world settings and click "Create New World"
- Select your world and click "Edit"
- Click "Open World Folder"
- Enable the "Update 1.21" feature flag
level.dat. A simple way to do this is by installing the NBT Viewer extension for VSCode
- Open the
level.datfile in VSCode by dragging the file from the file explorer to the VSCode window - Inside
Data, add a new list tag calledenabled_features
- Inside this list, add two new string tags with
minecraft:vanillaandminecraft:update_1_21. Select the yellow string icon when adding the first tag.
- Press
Ctrl + Sto save the file, make sure the world is not open in-game when editing the file! - In the world save folder, find the
datapacksfolder and put the downloaded zip file in there
- You can now open the world!
- Download the server jar from the bottom of the 1.20.4 article
- Place the
server.jarfile in the server folder - Inside this same folder, create the folders
world/datapacks/ - Put the downloaded zip file in there
- Run the server jar for the first time
java -Xmx1024M -Xms1024M -jar server.jar nogui
- Agree to the EULA by editing
eula.txt - Run the server jar again. You should see
Found new data pack file/update_1_21_no_trial_chambers_1.20.4.zip, loading it automaticallyin the log.
- Shut down the server
- Modify the
world/level.datfile following the same instructions from "Adding to an existing singleplayer world" - Add the downloaded zip file to the
world/datapacks/folder - Restart the server
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20.5, 1.20.6
- 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.
File checked by MCModsHub
- Downloads as update_1_21_no_trial_chambers_1.20.6.zip
- Download size: 140 KB
- Download link checked 29 Oct 2026 — working
These come from our own check of the pack file, not from the source page.