Configurable Mob Potion Effects Mod (1.21.8, 1.20.1) – Full Control Over Mob Buffs and Debuffs

If you’re looking to customize mob behavior and difficulty beyond what’s possible in vanilla Minecraft, Configurable Mob Potion Effects Mod (1.21.8, 1.20.1) gives you total command over how mobs behave with potion effects. Designed with server admins and modpack creators in mind, this mod allows you to assign permanent potion effects to any mob or configure on-hit status effects when mobs attack players or other entities.

Whether you want to make your zombies poisonous, give skeletons Speed II, or turn endermites into mini-bosses with Levitation, this mod gives you the flexibility to do it all without writing a single line of code. The system is entirely text-based using auto-generated configuration files, making it easy to tweak balance or create custom challenges for PvE gameplay.

Features:

• Assign Permanent Potion Effects to Mobs
  Give any mob persistent effects like Speed, Strength, Resistance, or Invisibility by editing permanenteffects.txt.
• Apply Effects on Damage
  Configure mobs to inflict status effects like Poison, Slowness, Levitation, or Blindness when they attack, via ondamageeffects.txt.
• Fully Server-Side
  No client installation required ideal for multiplayer environments and server packs.
• Comprehensive Configuration System
  • Located at ./config/configurablemobpotioneffects/
  • Configs are auto-generated with all available mobs and potion effects set to level 0 by default.
• Live Reloading with Commands
  Use /cmpe reload to apply your changes instantly without restarting the server or game.
• Highly Flexible Customization
  Apply any valid Minecraft potion effect, choose the amplifier level, and optionally add durations for on-hit effects.
• Extreme Use Cases Supported
  Give mobs effects at levels beyond vanilla limits (e.g. Speed 50 or custom combo buffs).

Configuration System:

The mod works through two core config files:

• permanenteffects.txt
  Assigns potion effects that mobs will always have.
  Example:
  minecraft:slime speed 50
• ondamageeffects.txt
  Assigns potion effects that mobs apply to others when they deal damage.
  Example:
  minecraft:zombie poison 2
minecraft:endermite levitation 1 1s

These files are created automatically on first run and are easy to edit manually.

Screenshots:

Crafting Recipes:

We recommend installing Just Enough Items (for Forge-based mods) or Roughly Enough Items (for mods using the Fabric modloader) to view all available recipes in this mod.

Requires:

Minecraft Forge or Fabric API

How to install:

How To Download & Install Mods with Minecraft Forge

How To Download & Install Fabric Mods

How To Download & Install The Quilt Loader

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Why use Configurable Mob Potion Effects Mod?

Minecraft offers limited control over how mobs behave in survival or PvE maps but Configurable Mob Potion Effects Mod changes that. It opens the door to designing new mob classes, enhancing RPG-like combat, creating themed encounters, or simply increasing difficulty without using command blocks or datapacks.

This mod is perfect for modpack creators who want to make their mobs stand out, server admins looking to create custom dungeons or bosses, or players who enjoy tweaking the vanilla experience. With total control and no coding required, it’s a powerful utility that turns basic mobs into customizable threats or allies.