SG Mob Spawn
SG Mob Spawn changes which mobs appear in certain places by adding harder spawn variants to vanilla mob spawning on Fabric.
What it does
Several vanilla mobs gain higher-difficulty spawn variants. Evokers usually produce the illager variant that summons less often, and zombies occasionally spawn riding a zombie horse during thunderstorms. Spiders below a set height mostly spawn as cave spiders, and bats below the same height can spawn as silverfish. Blazes have a high chance of appearing in breeze biomes and warped forests.
The changes apply on the server and on the client, so both sides of a game need the mod installed. The code is open source under the MIT License. Files are published for Fabric only, with 1.21.8 as the latest build, dated 2025-07-23, and the set covers 1.21.5 – 1.21.8. Source code and an issue tracker are linked from the project page.
Key features
Evoker spawn swap
Evokers have an 80% chance to spawn as their stronger variant, making encounters with them more common.
Cave spider spawns
Spiders below Y 0 spawn as cave spiders 85% of the time, which shifts underground encounters.
Silverfish spawns
Bats below Y 0 can spawn as silverfish in half of the cases, adding a new hazard to deep areas.
Zombie horse riders
A small share of zombies spawn riding a zombie horse during thunderstorms.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Harder night exploration
Players who want more threatening encounters in the overworld can rely on the changed spawn rates while traveling.
Deep mining runs
Miners working below the zero level meet cave spiders and silverfish more often than in unmodified spawning.
Who it’s for: Players who want tougher and more varied mob encounters in survival worlds, and server owners who want to adjust the spawn balance for their players.
How it compares
Zombie Horse Trap is server-side only, open source under the GNU Lesser General Public License v3.0 only, and published for 1.21.1 – 26.3, so players can join without installing it. Difficulty Overhauled is client and server, covers 1.21.1 – 1.21.11 on Fabric, and is under All rights reserved, not open source. Midrian - Zombie Apocalypse [Legacy] targets 1.21.11 only, is client and server, and is licensed under Creative Commons Attribution No Derivatives 4.0.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| SG Mob Spawn | Fabric | 1.21.5 – 1.21.8 | Client and server | 2025-07-23 |
| Zombie Horse Trap | Fabric | 1.21.1 – 26.3 | Server-side only | 2026-10-01 |
| Difficulty Overhauled | Fabric | 1.21.1 – 1.21.11 | Client and server | 2026-06-01 |
| Midrian - Zombie Apocalypse [Legacy] | Fabric | 1.21.11 | Client and server | 2026-08-21 |
Questions
Does SG Mob Spawn need to be installed on the server?
Which game versions does SG Mob Spawn support?
Does SG Mob Spawn work with Forge or NeoForge?
In the catalog
SG Mob Spawn is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 17,695 mods support Minecraft 1.21.8.
More from arielmontoya24
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What the author says
A mod that adds mob spawns for higher difficulty like illusioners, zombie horses, cave spiders, etc. When spawn in high difficulty: - Blazes have a 70% chance to spawn a Breeze if the biome is warped forest - Spiders bellow Y 0 have a 85% to spawn a Cave spider - Bats bellow Y 0 have a 50% chance to spawn a…
Official listing
- Modrinth page
- modrinth.com/mod/sg-mob-spawn
- Owner
- arielmontoya24
- Published
- 2025-05-21
- Updated on Modrinth
- 2025-07-23
- Facts verified
- 2026-10-15