Mobs Blocker

Mod

Mobs Blocker is a simple and effective admin tool to prevent any mob from spawning on your server via a simple command.

Type

Mod

Modrinth Downloads

26,708

Modrinth ID

W0JWCVNo

Last Updated

Aug 24, 2026

Description

Mobs Blocker

Advanced Spawn Control for Your Server

Mobs Blocker has been completely re-architected to give you granular control over entity spawning. Stop mobs based on specific conditions (natural spawns, spawners, eggs) or apply rules globally across mob categories.

Report a Bug or Suggest a Feature

⚠️ UPDATE NOTICE: This mod has been rewritten and currently ONLY supports version 1.2.0. For version 1.1.0, please check the GitHub repository. Versions below 1.1.0 are no longer supported.

🚀 How It Works & Core Features

The Logic System

Mobs Blocker intercepts every entity spawn attempt and checks rules in this specific order:

Specific Rules: Is there a rule for this exact Entity ID? (e.g., minecraft:zombie)
Preset Rules: If not, is there a rule for its Category? (e.g., monsters)
Global Rules: If not, is there a Global rule set?

Key Features

Granular Control: Block mobs based on how they spawn (Natural, Spawners, Eggs, Commands).
Smart Presets: Apply rules to entire categories (e.g., block all monsters or water_creatures).
Global Settings: Apply a rule to every entity on the server instantly.
In-Game Management: Full command system with auto-completion.
Zero Lag: Uses optimized HashSet lookups and hooks into NeoForge events for minimal performance impact.
Server-Side Only: Clients do not need to install this mod.

📜 The Rules System (Understanding Block Types)

When adding a rule, you define what to block. You can block specific sources or use "Inverse Mode" to allow only specific sources.

Rule Keyword	Effect
`all`	Blocks ALL spawns for this target.
`natural`	Blocks natural spawns (darkness, biome generation).
`spawner`	Blocks mob spawners (dungeons, trial spawners).
`egg`	Blocks spawn eggs and dispensers.
`command`	Blocks `/summon` or command block spawns.
`!natural`	Inverse: Blocks everything EXCEPT natural spawns.
`!spawner`	Inverse: Blocks everything EXCEPT spawners.
`!command`	Inverse: Blocks everything EXCEPT commands.

💻 Command Guide (Usage Examples)

All commands require OP Level 4.

1. Specific Mob Control (`add`)

Target a single entity type.

Block Zombies completely:
```
/spawnblocker add minecraft:zombie all
```
Block Creepers from spawning naturally (but allow spawners/eggs):
```
/spawnblocker add minecraft:creeper natural
```
Allow Skeletons ONLY from Spawners (Inverse Mode):
```
/spawnblocker add minecraft:skeleton !spawner
```

2. Category Presets (`preset`)

Apply rules to groups of mobs. Available categories: monsters, creatures, ambient, water, misc.

Block all Monsters from spawning naturally:
```
/spawnblocker preset monsters natural
```
Disable all ambient creatures (Bats, etc.):
```
/spawnblocker preset ambient all
```

3. Global Settings (`global`)

Apply a fallback rule to the entire server.

Disable Natural Spawning server-wide (Adventure mode style):
```
/spawnblocker global natural
```

4. Management & Utilities

Remove a rule:

/spawnblocker remove minecraft:zombie
/spawnblocker remove preset monsters

List active rules:
```
/spawnblocker list
```
Reload Config (from disk):
```
/spawnblocker reload
```
Reset Everything (Wipe Config):
```
/spawnblocker reset
```

📂 Configuration File (Manual Editing)

The configuration is saved automatically to config/spawnblocker.json. You can edit this file manually if the server is stopped.

Example spawnblocker.json:

{
  "minecraft:phantom": [
    "all"
  ],
  "preset:monsters": [
    "natural"
  ],
  "minecraft:zombie": [
    "!spawner"
  ],
  "global_settings": [
    "command"
  ]
}