You Shall Not Spawn! Mod (1.20.1) – Entity Spawn Blocking

Tired of hostile mobs ruining your builds or passive creatures tanking your server's performance? You Shall Not Spawn! gives you surgical control over which entities can appear in your world — and which ones get permanently evicted. Created by ElocinDev and downloaded over 4.5 million times, this lightweight utility mod lets you block specific spawns globally, per dimension, or even reduce spawn rates with simple config edits. Whether you're running a creative server or just hate Phantoms with a passion, this one belongs in your mod folder.

Key Features

• Global Entity Blocking — Add any entity's ID to the disabled_entities.json5 config file and it will never spawn again. Perfect for permanently removing nuisance mobs like Phantoms, Creepers, or modded enemies you don't want in your world.
• Regex-Based Filtering — Need to disable an entire mod's mobs at once? Use regular expressions with the !expression syntax to block multiple entities in a single line, saving you from listing dozens of IDs manually.
• Per-Dimension Spawn Control — Fine-tune entity spawning on a per-dimension basis through per_dimension_entities.json5. You can reduce spawn rates in specific dimensions rather than blocking mobs outright, giving you granular control over mob density.
• Well-Documented Config — The JSON5 configuration files ship with built-in explanations and examples, so you won't need to dig through wikis to figure out the correct format.

Screenshots

How to Install

1. Download and install your preferred mod loader (Forge, Fabric, NeoForge, or Quilt) for your Minecraft version.
2. Install the required dependency — Necronomicon API — and Fabric API if you're using Fabric or Quilt.
3. Download the correct You Shall Not Spawn! file for your loader and Minecraft version.
4. Place the downloaded .jar file into your .minecraft/mods folder.
5. Launch Minecraft, then edit the config files in config/ysns/ to block or adjust entity spawns to your liking.

Requirements

Pros & Cons

Download

What's New

• v2.0.2: Fixed a crash that occurred when using regex patterns on per-dimension bans.
• v2.0.1: Added fallback spawn checks to catch edge cases where blocked entities could still appear, plus fixed a crash on dedicated servers.
• v2.0.0: Major rewrite introducing per-dimension blocking and spawn rate reduction alongside global bans.
• Config format migrated from the old system to JSON5 for better readability and comment support.
• Added regex support, enabling patterns like blocking all mobs from a mod except specific ones.

FAQ

Can I use You Shall Not Spawn! to disable Phantoms only?

Yes. Simply add minecraft:phantom to the disabled_entities.json5 config file and Phantoms will no longer spawn in your world. This works for any entity — just use its full namespace ID.

Does this mod work on multiplayer servers?

Yes, You Shall Not Spawn! works on servers. The v2.0.1 update specifically fixed a crash that affected dedicated server environments, so make sure you're running the latest version.

Can I reduce mob spawn rates instead of blocking them completely?

Yes. The per_dimension_entities.json5 config lets you adjust spawn frequency for specific entities in each dimension, so you can lower spawn rates without removing mobs entirely.

You May Also Like

Screenshot to Clipboard Mod (1.21.11, 1.20.1) – Save All Screenshots

1 week ago

Gaia Dimension Mod (1.21.11, 1.20.1) – A Realm In An Unknown Place

2 weeks ago

WTHIT Mod (1.21.11, 1.20.1) – What The Hell Is That?

1 week ago

Sync Fix Mod (1.20.1) – Stabilized Server Ticks And Desync Reduction

1 week ago

Faster Random Mod (1.20.1) – Makes The RNG System 100x Faster

1 week ago

YUNG's Bridges Mod (1.21.4) – Beautiful Naturally Generated Bridges

4 weeks ago