Mofu's subnauticraft

This small project plans to add all of the subnautica's leviathan in minecraft, starting with the reaper leviathan

2.1K Downloads

forgemobs

Rent Server with this Mod

Screenshots

About this Mod

As a celebration for the early access of subnautica 2, i wanted to make a small project that adds all of the first game's leviathan
with the first one being the reaper leviathan

as of now the mod contains the reaper mob, that can spawn in most deep oceans.
a craftable seamoth
and a statue as a trophy if you get to kill the guy
and thats it.

the reaper has its own unique AI and set of attacks, and a "jumpscare" if the player gets attacked when low enough.
they spawn in all of the deep ocean biomes

pls report any bugs in the comments, and if you wish for me to continue this small project.

WARNING
TRUE SIZE COMMAND CANNOT BE UNDONE, BUT CAN BE LOCKED/UNLOCKED IF U WANT

I also made a youtube video on the process of making the mod and why i made it.
https://www.youtube.com/watch?v=gzaYuvKlcoQ

Available Versions

Mofu's subnauticraft 1.0.0release

MC 1.20.1forge

May 10, 2026

How to Install Mofu's subnauticraft 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 (1.20.1).

Install Mod

Open the mod browser in the dashboard and search for "Mofu's subnauticraft". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

forge

Minecraft Versions

1.20.1

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Mofu's subnauticraft 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 (1.20.1). You can switch loaders with one click in the panel.

Is Mofu's subnauticraft compatible with forge?

Mofu's subnauticraft officially supports forge for Minecraft 1.20.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Mofu's subnauticraft – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Mofu's subnauticraft 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.