Complementary Nautilus
by nanorover59
Complementary Nautilus adds nautilus mobs to ocean biomes, a cephalopod with a spiral shell that drops a nautilus shell when defeated.
What it does
The mod places nautilus mobs in the default ocean and the lukewarm and deep variants of ocean biomes, using a biome spawn tag so the spawns can be adjusted in a data pack. Each nautilus drops exactly one nautilus shell. Its swimming is motion-based, so it moves a little faster when fleeing players, and out of water it falls over on its side.
The author describes the purpose as a straightforward complement to vanilla: the nautilus shell is a rare item in the base game, used for crafting a conduit and for trading a trident, and some players find it too uncommon to obtain. The mod adds a living source for the shell while keeping the spawns rare. It runs on Fabric and NeoForge, and the client and server both need it. Files cover 1.20.4, 1.20.6, 1.21, 1.21.1 and 1.21.8, with 1.4.0 for 1.21.1 as the latest file on both loaders, released under the MIT License and open source. Public source code is available.
Key features
Nautilus mobs in ocean biomes
Nautilus spawn in the default ocean and the lukewarm and deep ocean variants, with rare spawn rates.
Biome spawn tag
The spawn biomes are set through a worldgen tag in the nautilus data folder, so a data pack can change them.
Shell drop per defeat
Each defeated nautilus drops exactly one nautilus shell, giving a steady source of the item.
Fleeing swim behavior
The nautilus swims with a motion that is slightly faster when escaping players, and it falls over when out of water.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
No Nautilus is a Fabric, Forge, NeoForge and Quilt mod for 1.13 – 1.21.11 that is server required with optional client, under All rights reserved and not open source. Krakentilus is a Forge and NeoForge mod for 1.20.1 – 1.21.1 that needs both client and server, also under All rights reserved. Complementary Nautilus is client and server, MIT licensed and open source, and covers Fabric and NeoForge.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Complementary Nautilus | Fabric and NeoForge | 1.20.4 – 1.21.8 | Client and server | 2025-11-18 |
| No Nautilus ❌ | Fabric, Forge, NeoForge and Quilt | 1.13 – 1.21.11 | Server required, client optional | 2025-12-10 |
| Krakentilus | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2025-11-11 |
Questions
Which loaders does Complementary Nautilus support?
Does Complementary Nautilus need to be installed on the server?
Can the nautilus spawn biomes be changed?
In the catalog
Complementary Nautilus is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 17,695 mods support Minecraft 1.21.8.
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What the author says
Have you ever looked at the nautilus shell from vanilla Minecraft and felt like something is missing? A nautilus is a cephalopod with a spiral shell considered to be a "living fossil" more closely related to early cephalopods than other modern species. I know the nautilus shell is supposed to be a rare item for…
Official listing
- Modrinth page
- modrinth.com/mod/complementary-nautilus
- Owner
- nanorover59
- Published
- 2024-03-20
- Updated on Modrinth
- 2025-11-18
- Facts verified
- 2026-10-15