Don’t Open That. – Horror Mystery Mod
All minecraft loot chests have a 20% chance to have THE MIMIC.
Screenshots
About this Mod
⚠️ DO NOT OPEN IT.
This is a short horror mod that makes a chest an object you were never meant to interact with.
Once you open it... things start to change.
👁 Features:
- Strange events
- Hidden surprises
🔊 Best played alone, at night, with sound on.
You’ve been warned.
Available Versions
How to Install Don’t Open That. – Horror Mystery Mod on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.5).
Install Mod
Open the mod browser in the dashboard and search for "Don’t Open That. – Horror Mystery Mod". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.5, 1.21.4, 1.21.3 (+13 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Don’t Open That. – Horror Mystery Mod server crashes on startup – what to do?
Most common cause: wrong fabric 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 (1.21.5). You can switch loaders with one click in the panel.
Is Don’t Open That. – Horror Mystery Mod compatible with fabric and forge?
Don’t Open That. – Horror Mystery Mod officially supports fabric, forge for Minecraft 1.21.5, 1.21.4, 1.21.3. 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 Don’t Open That. – Horror Mystery Mod – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Don’t Open That. – Horror Mystery Mod 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.
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Install Don’t Open That. – Horror Mystery Mod with just one click on your server.