Reaper Leviathan

A mod that adds Reaper Leviathan from “Subnautica” to the deep oceans of Minecraft.

291 Downloads

neoforgeadventuremobs

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About this Mod

This mod adds Subnautica's “Reaper Leviathan” to Minecraft's deep oceans. A giant intimidating sea creature that terrorizes the deep oceans!

Minecraft's oceans are still very peaceful and easy, so why not make things more interesting by putting a giant sea creature in them? The Reaper Leviathan mod adds the iconic creature from “Subnautica” to Minecraft's deep oceans, to make aquatic exploration more challenging! Just like the Warden in Minecraft, (and the Reaper in Subnautica) the Leviathan is a dangerous obstacle in your Adventure to be faced with caution, making exploration in the game less monotonous and exciting!

(The Leviathan can be found in the deep oceans of Minecraft)

Available Versions

Reaper Leviathan 1.0.0release

MC 1.21.4neoforge

June 8, 2025

How to Install Reaper Leviathan on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.4).

Install Mod

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

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.21.4

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Reaper Leviathan server crashes on startup – what to do?

Most common cause: wrong neoforge 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 (1.21.4). You can switch loaders with one click in the panel.

Is Reaper Leviathan compatible with neoforge?

Reaper Leviathan officially supports neoforge for Minecraft 1.21.4. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Reaper Leviathan – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Reaper Leviathan 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.