Ultris: Boss Expansion
Modby limesplatus
A Boss Expansion mod that adds 8 unique new bosses that fit seamlessly into vanilla.
Type
Mod
CurseForge Downloads
2,313,746
CurseForge ID
634942
Last Updated
Jun 11, 2026
Description
![]()
Ultris has a Discord Server for getting help and discussing my mods! Click here to join.
About:
Ultris is a Minecraft Boss Expansion datapack that expands Minecraft with 8 new exciting bosses to take on, each with their own quests and rewards. Explore multiple new boss structures, special items, and new foes for you to take on.
Unique boss patterns, boss music, stages, sounds and visuals all come together to create these awesome bosses, from bosses that can spawn early game, to bosses for the end game player.
To summon the bosses, use /function 1_splatus:ultris/admin_menu and select the option "Summon Bosses"
Wiki:
To view more info on bosses, you can check out the Ultris wiki by clicking here
The Wiki is not complete, but it can be completed faster with your help! If you'd like to contribute to the wiki, join my Discord Server, ping @LimeSplatus#4730 and I'll allow you access to editing.
Commands:
/function 1_splatus:ultris/admin_menu
Original Sound Track:
Downloading:
1. As for all mods, Open your minecraft's mods folder %AppData% > .minecraft > mods and drag the mod jar into this folder
2.This mod requires Fabric API aswell so install that as well
3. Once its in, you can launch minecraft on the fabric world and Ultris will automatically load on the (singleplayer) worlds you join
A 1.17 and 1.18 version of Ultris is also included on my Discord Server, join it and check the #versions channel if you need it! (Datapack Version Files Only)
Join the Discord Server to chat, discuss, and get help with my datapacks!
https://discord.gg/XZVARKkjwt
Help support the making of my datapacks with memberships or donations on Ko-fi!
https://ko-fi.com/limesplatus/tiers
Thank you to my Ko-Fi Donators:
• Shayindra#4622
• Churner#6711
Credits:
Creator/Programmer: • LimeSplatus#4730
Blaze King Music: • humanoid#9099
Optimization Help: • Holmes (iRedSC)#0281
Multiple Blaze King Tower Rooms By:
• the game master#0666 ,
• Just Fan Account#2495
• Frektip#4587
• Churner#6711
Similar Mods
YABBA
Yet Another Better Barrel Attempt
Tesseract
Tesseract allows you to transport Items, Fluid and Energy
Modern UI
Creates UI with smooth font, animations, emoji, blur effect, optimization, international text and many features
The Graveyard (FABRIC)
A mod that adds structures, mobs and blocks themed aroung the graveyard.
Chickens
Chickens mod adds... chickens. Lots of chickens!
Better Animations Collection
Changing the in-game models to allow for better animations and subtle effects.