ModsFinder

Nautilus & Spears | Mounts of Mayhem backport fix

by dvirov

Nautilus & Spears | Mounts of Mayhem backport fix patches zombie nautilus and zombie horse behavior from the Mounts of Mayhem update on 1.21.1.

FabricForgeNeoForgeQuiltServer required, client optionalMIT License1.21 – 1.21.1

What it does

Nautilus and zombie horse mobs in the backported mod burn in daylight and suffocate outside water. This fix adds sunlight protection through armor, and it makes those mobs despawn more often when no player is within 128 blocks or when they carry no name tag. A random despawn chance between 30 and 128 blocks from a player applies as well.

A command grants immunity to chosen mobs, and a datapack bundled with the fix corrects further bugs in the backport. The mod requires Nautilus & Spears | Mounts of Mayhem, which must be installed alongside it. Files are published for Fabric, Forge, NeoForge and Quilt on 1.21 and 1.21.1, under the MIT License, and the code is not open source. Only the server needs it, and players may add it without any change on their side.

Key features

  1. Daylight burning fix

    Zombie nautilus and zombie horses burn in sunlight less often than in the unfixed backport.

  2. Water suffocation fix

    Nautilus no longer suffocate when they are outside water, as the original backport caused.

  3. Armor sunlight protection

    Horse and nautilus armor protects the wearer from sunlight, so armored mounts stop burning.

  4. Immunity command

    A command grants immunity to chosen mobs, letting server owners exempt specific creatures.

Compatibility

Latest build for each game version and loader.

1.21.11.0+mod1.0+mod1.0+mod1.0+mod
1.211.0+mod1.0+mod1.0+mod1.0+mod
ReleaseBetaAlphaNot available

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

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Nautilus & Spears | Mounts of MayhemThis is a mod in which I added drop Mounts of Mayhem to the old versions of minecraft
Required

Questions

Does this fix need Nautilus & Spears | Mounts of Mayhem?

Yes. Nautilus & Spears | Mounts of Mayhem is a required dependency and must be installed alongside this fix on each loader.

Does the server need this mod?

Yes. The server must run the fix, while players may leave it out and join without installing anything.

Which game versions does the fix cover?

Files target 1.21 and 1.21.1, with 1.0+mod for 1.21.1 as the latest file on Fabric, Forge, NeoForge and Quilt.

In the catalog

Nautilus & Spears | Mounts of Mayhem backport fix is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 32,366 mods support Minecraft 1.21.1.

Optimization mods3,545Fabric modsMods for 1.21.132,366

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What the author says

While trying the mod Nautilus & Spears | Mounts of Mayhem backport i noticed few bugs so i made small datapack to fix some of the bugs with this mod fixes: - zombie nautilus and horse can now despawn if the closes player is more than 128 blocks from it (name tag prevent despawn) - zombie nautilus and horse now burn…
dvirov, on the Modrinth page

Official listing

Owner
dvirov
Published
2026-10-01
Updated on Modrinth
2026-10-05
Facts verified
2026-10-15

Tags

Game mechanicsMobsOptimization
Open on ModrinthCompare