Cave Spider Spawn Mod (1.21.8, 1.20.1) – Enable Natural Cave Spider Spawns Underground

Cave Spider Spawn Mod (1.21.8, 1.20.1) introduces a new layer of danger to your underground adventures by enabling cave spiders to spawn naturally throughout the world. In the base game, cave spiders are only encountered through spawners found in abandoned mineshafts. This mod changes that by allowing them to appear as part of the natural mob spawning process in caves, making underground exploration more challenging and intense.

By default, cave spiders have a 15% chance of spawning underground. This increased presence brings their poisonous bite and smaller hitbox into the regular gameplay loop, making your trips through cave systems more hazardous. The mod also includes a configurable option to restrict their spawning to specific depths, such as only below Y-level 0, which ties them thematically to the deepslate layer.

Whether you’re playing in survival mode, designing hardcore modpacks, or simply want to increase the stakes of mining trips, this mod provides a simple but effective way to add risk to the underground biome.

Features

Natural Cave Spider Spawning
Cave spiders are no longer limited to spawners. They now have a chance to spawn in caves as part of regular mob generation.
Configurable Spawn Chance
The default spawn rate is set to 15%, but this can be adjusted through the configuration file to suit your desired difficulty level.
Y-Level Spawn Restriction Option
You can choose to allow cave spiders to only spawn below a certain Y-level, such as under Y=0. This feature is disabled by default and can be toggled in the config.
Enhanced Underground Difficulty
Increases the threat level of cave exploration without disrupting the overall balance of surface gameplay.