ModsFinder

Reaper Leviathan

by Herobibes

Reaper Leviathan adds a giant sea creature from Subnautica to the deep oceans of Minecraft, turning ocean exploration into a more dangerous task.

NeoForgeClient and serverCC0 1.0 Universal1.21.4

What it does

The mod adds the Reaper Leviathan, a large hostile creature that lives in the deep oceans. It is modeled on the Subnautica creature of the same name and is meant to be faced with caution, much like the Warden, as a dangerous obstacle for players who travel below the surface. The mod is aimed at making exploration less monotonous, since Minecraft's oceans are otherwise quite peaceful.

Reaper Leviathan is a NeoForge mod for version 1.21.4 only. It needs to be installed on both the client and the server, so every player and the server must run it. The mod is released under CC0 1.0 Universal, which places its work in the public domain, and it is not open source. The first and latest file, 1.0.0, was published on 2025-06-08.

Key features

  1. Deep ocean creature

    A giant, intimidating sea creature is found in the deep oceans and can threaten players who explore there.

  2. Subnautica-inspired design

    The Leviathan is based on the iconic Reaper creature from the Subnautica series.

  3. Challenging exploration

    The creature turns deep-ocean travel into a dangerous obstacle that calls for caution.

Compatibility

Latest build for each game version and loader.

1.21.41.0.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Who it’s for: Players who want more threats in the ocean biomes of a survival world, and server owners who want exploration below the surface to carry more risk.

How it compares

Full comparison

Beyond the Ocean is a NeoForge mod for 1.21.1 with the client and server environment, under All rights reserved. Ocean Giants is server-side only, uses the MIT License and covers 1.21.1 – 1.21.11 on Forge and NeoForge, so players can join without installing it. Lost River is open source under the MIT License and covers 1.20.1 – 1.21.1 on Forge and NeoForge with the client and server environment.

ModLoadersGame versionsEnvironmentUpdated
Reaper LeviathanNeoForge1.21.4Client and server2025-06-08
Beyond the OceanNeoForge1.21.1Client and server2026-06-21
Ocean GiantsForge and NeoForge1.21.1 – 1.21.11Server-side only2026-07-18
Lost RiverForge and NeoForge1.20.1 – 1.21.1Client and server2025-02-16

Questions

Does Reaper Leviathan need to be installed on the server?

Yes. Servers that run it need every player to install it too.

Which loader does Reaper Leviathan support?

It is published for NeoForge only, for 1.21.4. Forge and Fabric files are not listed.

In the catalog

Reaper Leviathan is one of 11,058 Mobs mods on ModsFinder, and one of 4,974 Mobs mods for NeoForge. 17,979 mods support Minecraft 1.21.4.

Mobs mods11,058NeoForge modsMods for 1.21.417,979

More from Herobibes

All projects
There's something in the caves1.20.1 – 1.21.1In the depths1.20.1 – 1.21.1

Similar mods

[EMF] Entity Model Features1.18.2 – 26.3L_Ender's Cataclysm1.19.2 – 1.21.5Guard Villagers1.16.5 – 26.3Animal Feeding Trough1.16.5 – 26.3Just Enough Breeding (JEBr)1.15.2 – 26.3TslatEntityStatus1.16.5 – 26.3

What the author says

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…
Herobibes, on the Modrinth page

Official listing

Owner
Herobibes
Published
2025-06-08
Updated on Modrinth
2025-06-08
Facts verified
2026-10-15

Tags

AdventureMobs
Open on ModrinthCompare