CurseForge · Minecraft mod
Bosses Unleashed
Casual boss mod for minecraft.
Quick answer
Which Bosses Unleashed release should I use?
Bosses Unleashed bossesunleashed-1.0.4-hotfix.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is Bosses Unleashed required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Bosses Unleashed bossesunleashed-1.0.4-hotfix.jar need?
bossesunleashed-1.0.4-hotfix.jar. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Bosses Unleashed without breaking your instance.
Built for Bosses Unleashed bossesunleashed-1.0.4-hotfix.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use bossesunleashed-1.0.4-hotfix.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside bossesunleashed-1.0.4-hotfix.jar. It opens that exact file at the source.
About this project
What does Bosses Unleashed add?
Mobs :
- Jellyfish

This li'll jellyfish can be found in special dimension.
In order to enter the dimension, you need to find a wormhole that can be found in end high lands.
If someone entered wormhole, it will be disappear after 10 seconds.
When you entered a dimension, you'll see this li'll jellyfish floating in air.
You can just watch it forever, or...
If you hit them, it will show it's real form
Below is video of the boss.
한국 분들은 아래의 영상도 시청해주세요!
Additional notes:
You'll revive in the dimension when die.
but once defeat the boss and enter the wormhole again, it will restore your original respawn point.
If jellyfish finished to create clones and start shooting orbs toward you, you can hit real one to make all clones disappear.
In final phase, you need to hit jellyfish to stop them, otherwise...
Drop Items :
- Celestial Jelly

Material and food item.
Can be crafted to jellyfish armor set or jellyfish umbrella. (see JEI for recipe)
It will restore lot of hunger bar but will restore very low amount of saturation.
Celestial Core

Just material item, required for jellyfish chestplate and jellyfish umbrella.Celestial Jellyfish Armor

Currently doesn't have special ability, just high defenceCelestial Jellyfish Umbrella

When folded, right click to use dash ability and make a trail of celestial orbs.

When unfolded, immune to fall damage and grants slow falling.
Art by Supreme King of cats
Some effects are from shader toy
Project description from CurseForge.
Pick your setup
Bosses Unleashed by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Bosses Unleashed versions and loaders
bossesunleashed-1.0.4-hotfix.jar
3 Mar 2026
bossesunleashed-1.0.4.jar
3 Mar 2026
bossesunleashed-1.0.3.jar
9 Dec 2025
bossesunleashed-1.0.2.jar
7 Dec 2025
bossesunleashed-1.0.1.jar
28 Nov 2025
bossesunleashed-1.0.0.jar
27 Nov 2025
Looking for an older file? The official CurseForge project page is in Resources.