Passive Mob Spawn
by Luc1fer1o
Passive Mob Spawn, a NeoForge server-side mod for skyblock packs, lets passive animals appear on grass platforms players build high in the sky.
What it does
On a server that runs the mod, the spawner searches for valid positions around each player and tries to place the configured passive animals there during daytime. A position counts as valid when it is a grass block platform with room above it, within the build height. Attempts are made at a set interval, and the delay between checks can be changed in the config.
The default list contains cow, sheep, pig, chicken and rabbit, each weighted at 100. Weights decide how often each kind is picked, and plain ids such as minecraft:cow are accepted with a weight of 1. Blank entries are ignored. Spawns are skipped when a player stands too close, and nearby animals of the same type are counted so that the area does not get overcrowded. Debug logging is off by default.
Skyblock worlds and void-style progression packs leave animals without natural spawns, which is the gap this mod is meant to fill. Only the server needs the mod, so players join without installing anything. The mod is released for NeoForge 1.21.1 only, in version 1.0.0, published on 2026-06-28, and the code is under All rights reserved, so it is not open source.
Key features
Daytime-only spawning
Spawn attempts run only during the day, so the animals appear when players are most likely to be present.
Weighted passive mob list
Each configured animal carries a weight that sets how often it is chosen, and the default list uses equal weights of 100.
Crowding and distance checks
Spawns are skipped near a player, and an animal is not added where nearby animals of its type already reach the cap.
Configurable spawn checks
The delay between spawn checks is set in seconds in the config, which is generated on the first launch with debug logging off.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Skyblock islands
Players on small floating islands can get cows, sheep and other passive animals on the grass they build.
Progression packs
Pack makers can decide which animals appear and how often, by editing the weighted list.
Who it’s for: Server owners running skyblock or void-style worlds, and modpack authors who want passive animals on player-made grass platforms.
Questions
Does Passive Mob Spawn need to be installed on the client?
Which animals spawn by default?
Can the list of animals be changed?
More from Luc1fer1o
What the author says
Passive Mob Spawn is a lightweight server-side NeoForge mod for skyblock modpacks where passive animals need to spawn naturally on player-made grass platforms, even high in the sky. The mod adds a controlled supplemental passive mob spawner that looks for valid grass_block platforms around players and attempts to…
Official listing
- Modrinth page
- modrinth.com/mod/passive-mob-spawn
- Owner
- Luc1fer1o
- Published
- 2026-06-28
- Updated on Modrinth
- 2026-06-28
- Facts verified
- 2026-10-15