FogRule
by Neuromuser
FogRule ties hostile mob spawning to a dense fog that players clear away by placing blocks, so a base grows as the surrounding area is made comfortable.
What it does
Hostile mobs spawn only inside dense fog, so darkness alone does not bring them into a room. A world starts blanketed in fog, and building pushes the fog back from the area around the builder. Opening the F3 debug screen shows a player's local coziness reading, which reflects how much fog surrounds the spot they occupy. The mechanic is meant for long-term worlds, where building up a base is the main way to keep monsters out.
The Discomfort Chest is a functional block crafted from a chest and a diamond. Once placed, it must wait for a configurable amount of real-life time, until 8:00 PM server time, before it can be used. At that point it aggressively consumes the coziness around it and applies Mining Fatigue to players within 50 blocks. The chest gives back random loot from three tiers, with the tier depending on how much coziness it absorbed. Players can use this to build large castles or let older structures decay into hostile, fog-filled dungeons, and then return to harvest high-tier loot from them.
FogRule requires Lootr, and the mod is distributed for NeoForge only. A server running it needs every connecting player to have it too. Files cover 1.21.1 and bundle SQLite JDBC. The source code is public, and the code is under the MIT License.
Key features
Fog-bound mob spawning
Hostile mobs appear only where dense fog covers the ground, which ties their presence to how much of the area has been cleared.
Clearing fog by building
Placing blocks removes the fog around them, so construction directly changes where monsters can spawn.
Comfort level readout
The F3 menu shows a local comfort value, letting players see how far their cleared area reaches.
Discomfort Chest
A craftable block that waits for a set real-life time, then trades coziness for random loot in three tiers.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Embedded 1
How it compares
Void Fog is client-side only, works on Forge and NeoForge across 1.9.4 – 1.21.1, and is released under All rights reserved, so it does not change server behavior. Fogged is client and server, released under the MIT License, and built for NeoForge 1.21.1, which is the same version as FogRule. Rising Toxicity is client and server, not open source, and also only for 1.21.1 on NeoForge.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| FogRule | NeoForge | 1.21.1 | Client and server | 2026-08-04 |
| Void Fog | Forge and NeoForge | 1.9.4 – 1.21.1 | Client-side only | 2024-11-03 |
| Fogged | NeoForge | 1.21.1 | Client and server | 2026-09-19 |
| Rising Toxicity | NeoForge | 1.21.1 | Client and server | 2026-05-13 |
Questions
Does FogRule need Lootr installed?
Does the server need FogRule if players have it?
Which NeoForge file should a server use?
In the catalog
FogRule is one of 19,031 Adventure mods on ModsFinder, and one of 8,588 Adventure mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
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What the author says
This mod introduces a unique fog and comfort mechanic to Minecraft. The world is blanketed in a dense fog that players can clear away by placing blocks to build up their base. Hostile mob spawning is tied directly to this fog. Mobs can only spawn inside the dense fog, meaning that no matter how dark a room is…
Official listing
- Modrinth page
- modrinth.com/mod/fogrule
- Owner
- Neuromuser
- Published
- 2026-07-16
- Updated on Modrinth
- 2026-08-04
- Facts verified
- 2026-10-15