How do I install There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. In MC Java Mods, or directly above on this page.

What Minecraft version does There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob work with?

The listing gives Minecraft 1.21.1, 1.20.1. This is the version stated by the author or source site, not something we verified ourselves.

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There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob

Java mod listed for Minecraft 1.20–1.21. File opened and checked on 18 Oct 2026; downloads from the MC Java Mods app on Android.

by Moon

There's Something in The Caves Mod will add a new creepy mob to Minecraft. It will only spawn in lush caves and is named "The Unknown". Its movement is…

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There’s Something in The Caves Mod will add a new creepy mob to Minecraft. It will only spawn in lush caves and is named “The Unknown”. Its movement is reminiscent of Japanese horror films – sudden and with unnatural poses. He can only be damaged with a healing potion. However, it won’t actively pursue players. Instead, it will attack them if they get too close. Beware, as a single strike from this mob can send a player to their bed.

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 1

Features:

This mob spawns only in Lush Caves and can kill the player instantly with a jumpscare if it gets too close.
Adds a new layer of challenge and excitement to exploring Lush Caves.
The mob can only be damaged by a healing potion, making it a unique and tricky opponent.

Screenshots:

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 2

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 3

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 4

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 5

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 6

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 7

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 8

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 9

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 10

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 11

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 12

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 13

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 14

There's Something in The Caves Mod (1.21.1, 1.20.1) – The Unknown Mob — Minecraft Java mod, screenshot 15

There’s Something in The Caves Mod Download Links

For Minecraft 1.21.1, 1.21

NeoForge version: Download from Server 1 – Download from Server 2

For Minecraft 1.20.1, 1.20

Forge version: Download from Server 1 – Download from Server 2

For Minecraft 1.19.2

Forge version: Download from Server 1 – Download from Server 2

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.21.1, 1.20.1
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: In MC Java Mods, or directly above on this page.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

File checked by MCModsHub

Downloads as 198585.mcaddon
Download size: 2.2 MB
Download link checked 26 Jul 2026 — working
Mirrored on our own servers — the download does not depend on the original host

These come from our own check of the pack file, not from the source page.

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