CurseForge · Minecraft mod
Cave Spider Spawn
🕷️ Adds a chance for cave spiders to spawn naturally underground instead of a spider.
Quick answer
Which Cave Spider Spawn release matches 1.21.8 Forge?
Cave Spider Spawn [Fabric/Forge/Neo] 1.21.8-1.2 | Cave Spider Spawn targets 1.21.8 with Fabric, NeoForge, Forge. The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server. All 1 required mods have matching files.
Where it goes
Is Cave Spider Spawn required on the client, server, or both?
The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.
The source does not explicitly classify this release as client-only or server-only.
What else does Cave Spider Spawn [Fabric/Forge/Neo] 1.21.8-1.2 | Cave Spider Spawn need?
[Fabric/Forge/Neo] 1.21.8-1.2 | Cave Spider Spawn on 1.21.8 Forge. Every mod below is checked against that same setup.
Install Collective first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Cave Spider Spawn without breaking your instance.
Built for Cave Spider Spawn [Fabric/Forge/Neo] 1.21.8-1.2 | Cave Spider Spawn on 1.21.8 Forge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use [Fabric/Forge/Neo] 1.21.8-1.2 | Cave Spider Spawn. It targets 1.21.8 with Fabric, NeoForge, Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Collective first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside [Fabric/Forge/Neo] 1.21.8-1.2 | Cave Spider Spawn. It opens that exact file at the source.
About this project
What does Cave Spider Spawn add?

Cave Spider Spawn adds a chance for cave spiders to spawn naturally in place of a normal spider. By default they have a 15% chance to spawn and only below the surface, though this can be changed in the config. Adds a bit more difficulty to the game, due to cave spiders being able to poison players and they're harder to hit.
It's also possible to make cave spiders only spawn below a certain Y level. For example below y=0, which is where deepslate is. This is disabled by default, and can be toggled in the config.
All available config options:
chanceSpiderIsCaveSpider default 0.15, min 0, max 1.0
The chance a spider that has spawned is a cave spider.
onlySpawnCaveSpidersBelowSurface default true
When enabled, cave spiders will only spawn below the surface.
onlySpawnCaveSpidersBelowSpecificY default false
When enabled, cave spiders will only spawn below the specific y value set in 'belowSpecificY'.
belowSpecificY default 0, min -1000, max 1000
The specific y value used in 'onlySpawnCaveSpidersBelowSpecificY'.
You may freely use this mod in any modpack, as long as the download remains hosted within the CurseForge or Modrinth ecosystem.
Serilum.com contains an overview and more information on all mods available.
Comments are disabled as I'm unable to keep track of them across so many separate mod pages.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!
Project description from CurseForge.
Pick your setup
Cave Spider Spawn by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.2
4 loader builds26.1.2
4 loader builds26.1.1
4 loader builds26.1
4 loader builds1.21.11
4 loader builds1.21.10
4 loader builds1.21.9
4 loader builds1.21.8
4 loader builds1.21.7
4 loader builds1.21.6
4 loader builds1.21.5
4 loader builds1.21.4
4 loader buildsShowing the newest 12 of 22 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Cave Spider Spawn versions and loaders
[Fabric/Forge/Neo] 1.21.8-1.2 | Cave Spider Spawn
cavespiderspawn-1.21.8-1.2.jar
18 Jul 2025
Looking for an older file? The official CurseForge project page is in Resources.