Passive Mob Spawn
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 spawn configured passive animals during the day.
Features
- Allows passive mobs to spawn on grass platforms at any build height.
- Designed for skyblock worlds and void-style progression packs.
- Runs server-side and does not require client-side installation.
- Only attempts spawning during daytime.
- Supports weighted mob entries such as
minecraft:cow=100. - Supports configurable spawn check delay.
- Skips spawns too close to the player.
- Checks nearby mobs of the same type to reduce overcrowding.
- Includes optional debug logging for spawn attempts and denial reasons.
Spawn Conditions
The mod searches for valid spawn positions around players. A position is considered valid when:
- The base block is
minecraft:grass_block. - The block above is air, short grass, tall grass, fern, or a flower.
- The position is at least 16 blocks away from the player.
- The dimension is currently daytime.
- The local passive mob cap has not already been reached.
- There are fewer than 2 mobs of the same type within 16 blocks of the target position.
- The selected entity passes its normal Minecraft spawn, obstruction, and collision checks.
Configuration
After launching once, the config is generated at:
config/passivemobspawn-common.toml
Example:
[spawning]
debug = false
spawnCheckDelaySeconds = 60
passiveMobs = ["minecraft:cow=100", "minecraft:sheep=100", "minecraft:pig=100", "minecraft:chicken=100", "minecraft:rabbit=100"]
Config Options
debug: Enables detailed console logs for spawn checks, selected mobs, valid positions, and denial reasons.spawnCheckDelaySeconds: Delay between spawn checks. Higher values make passive mobs spawn less often.passiveMobs: Weighted list of entity ids the mod may spawn.
Weighted Mob Entries
Use entity_id=weight format:
minecraft:cow=100minecraft:sheep=50minecraft:rabbit=10
Plain ids such as minecraft:cow are also accepted and use weight 1. Blank entries are ignored.
Recommended For
- Skyblock modpacks
- Void worlds
- Progression packs where grass platforms should support passive animal spawning
- Servers that need configurable, controlled passive mob generation
