Do I need InsaneLib installed for this mod to work?

Yes, InsaneLib is a required dependency. The mod won't load without it. Download it separately and place it in your mods folder alongside this one.

Do my players need to install this mod on their clients?

Not from version 4.5.2 and up. It runs server-side only, so players can join without having the mod installed themselves.

How do I actually customize the mob properties?

You create a data pack that defines the traits and attributes you want mobs to spawn with. The mod reads those data pack rules and applies them in-game. There's no in-game GUI for this.

Does this work with modded mobs or only vanilla ones?

It can work with modded mobs as long as they follow standard mob property structures. Results may vary depending on the mod, so test it out with whatever mob mods you're running.

Can I use this to make a harder survival experience?

That's exactly what a lot of people use it for. You can give random mobs extra health, strength buffs, or potion effects to make survival much less predictable. Combined with a well-built data pack it works really well for harder modpacks.

Mobs Properties Randomness Mod (1.20.1, 1.19.4) - Custom Mob Traits

Mobs Properties Randomness Mod lets you change how mobs behave by writing data packs that assign random traits and properties to them. Creepers that blow up on spawn, Zombies that inflict potion effects, custom mini-bosses with beefed-up stats, it’s all on the table. It requires InsaneLib to function, and from version 4.5.2 onwards it runs purely server-side, so your players don’t need to install anything.

What This Mod Does

The whole point here is mob variety. Vanilla Minecraft mobs are predictable after a while, and this mod breaks that by letting you define what mobs spawn with. You write the rules in a data pack, and the mod applies them.

That’s where things get interesting. You can set Creepers to detonate the moment they spawn, give Zombies a chance to hit players with Weakness or Blindness, or create mini-boss variants with extra health and abilities. The mod itself doesn’t add specific content, it gives you the tools to build whatever mob chaos you want.

Features

Modify mob properties and attributes through custom data packs
Adds randomness to mob traits so no two encounters feel the same
Supports mini-boss creation with unique stats and custom abilities
Server-side only from version 4.5.2 and up, no client mod required
Requires InsaneLib

Crafting Recipes

Install Just Enough Items (for Forge) or Roughly Enough Items (for Fabric) to browse any recipes added by this mod in-game.

Requirements

Minecraft Forge

Insane Lib Mod

How to Install

Install Minecraft Forge for your Minecraft version.
Download and install InsaneLib first, it’s a hard dependency.
Download the mod .jar file from the links below.
Drop both .jar files into your .minecraft/mods folder.
Launch Minecraft using the Forge profile and you’re good to go.

How To Download & Install Mods with Minecraft Forge

How To Download & Install Fabric Mods

How To Download & Install The Quilt Loader

Mobs Properties Randomness Mod (1.20.1, 1.19.4) Download Links

For Minecraft 1.11.2

Forge Version:
Mobs-Properties-Randomness-Mod-Forge-1.11.2.jar
This file is part of Mobs Properties Randomness Mod (1.20.1, 1.19.4) – Custom Mob Traits. Visit the main page for features, installation guide, screenshots, and more download options.

Size: 32.8 KB
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For Minecraft 1.12.2

Forge Version:
Mobs-Properties-Randomness-Mod-Forge-1.12.2.jar
This file is part of Mobs Properties Randomness Mod (1.20.1, 1.19.4) – Custom Mob Traits. Visit the main page for features, installation guide, screenshots, and more download options.

Size: 65.1 KB
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For Minecraft 1.16.5

Forge Version:
Mobs-Properties-Randomness-Mod-Forge-1.16.5.jar
This file is part of Mobs Properties Randomness Mod (1.20.1, 1.19.4) – Custom Mob Traits. Visit the main page for features, installation guide, screenshots, and more download options.

Size: 107.9 KB
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For Minecraft 1.18.2

Forge Version:
Mobs-Properties-Randomness-Mod-Forge-1.18.2.jar
This file is part of Mobs Properties Randomness Mod (1.20.1, 1.19.4) – Custom Mob Traits. Visit the main page for features, installation guide, screenshots, and more download options.

Size: 145.0 KB
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For Minecraft 1.19.2

Forge Version:
Mobs-Properties-Randomness-Mod-Forge-1.19.2.jar
This file is part of Mobs Properties Randomness Mod (1.20.1, 1.19.4) – Custom Mob Traits. Visit the main page for features, installation guide, screenshots, and more download options.

Size: 132.9 KB
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For Minecraft 1.19.3

Forge Version:
Mobs-Properties-Randomness-Mod-Forge-1.19.3.jar
This file is part of Mobs Properties Randomness Mod (1.20.1, 1.19.4) – Custom Mob Traits. Visit the main page for features, installation guide, screenshots, and more download options.

Size: 132.6 KB
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For Minecraft 1.19.4

Forge Version:
Mobs-Properties-Randomness-Mod-Forge-1.19.4.jar
This file is part of Mobs Properties Randomness Mod (1.20.1, 1.19.4) – Custom Mob Traits. Visit the main page for features, installation guide, screenshots, and more download options.

Size: 127.9 KB
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For Minecraft 1.20.1

Forge Version:
Mobs-Properties-Randomness-Mod-Forge-1.20.1.jar
This file is part of Mobs Properties Randomness Mod (1.20.1, 1.19.4) – Custom Mob Traits. Visit the main page for features, installation guide, screenshots, and more download options.

Size: 164.5 KB
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