CurseForge · Minecraft mod
EXTREME CORE
Adds Bosses with EXTREME difficult
Quick answer
Which EXTREME CORE release should I use?
EXTREME CORE extremecore-1.2.0-forge-1.20.1.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 3 required mods have matching files.
Where it goes
Is EXTREME CORE 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 EXTREME CORE extremecore-1.2.0-forge-1.20.1.jar need?
extremecore-1.2.0-forge-1.20.1.jar. Change the file and its required mods may change too.
Install Curios API, GeckoLib, Caelus API 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 EXTREME CORE without breaking your instance.
Built for EXTREME CORE extremecore-1.2.0-forge-1.20.1.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use extremecore-1.2.0-forge-1.20.1.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Curios API, GeckoLib, Caelus API 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 this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside extremecore-1.2.0-forge-1.20.1.jar. It opens that exact file at the source.
About this project
What does EXTREME CORE add?
EXTREME CORE is a combat focused mod that introduces EXTREME difficulty boss raids, active skill mechanics, powerful equipment
Key Features
Boss Raids :
Can face 7 custom bosses with custom attack patterns and can be dodged simply with basic movement or dash active skill
Active skill, Defense system :
Make active use of defense accessories, active skills and the accessories that contain theme.
Can use Dash with invincibility frames, Cooldown based damage nullifying, revive accessories, Custom DR attribute & Life regen accessories and HIGH RISK, HIGH RETURN accessories & items
Config file :
Can customize the challenge to fit your playstyle
Freely adjust boss's Health, Damage, Attack cooldown via scaling multipliers
Can toggle boss's Damage cap, Damage Stack, Despawn, Vanilla wither overhaul
TIPS :
Make sure to use JEI mod : can check most item recipes
Check keybind before playing and customize theme
Don't Face tanking : Bosses has massive attack damage proportional to target's maximum health and this damage stacks
Feel free to use cheese strategies : Easily increase resources using Uncrafting Table, Long range attacks from a distance where boss's attacks cannot reach, Flying around using an Elytra or similar during boss fight
This mod was designed with the use standard tactics, but it does not prevent or ban cheese strategies feel free to play however you like
Blood ZombieHEALTH : 350
ATTACK : 4 + 100% of target's maximum health
this boss can be summoned by crafting and using Imperfect Core.
Blood Zombie is the first boss you will face in this mod.
Blood Zombie will attack at close range.
Wither
Wither is remade in this mod.
You can disable remade in config.
Blood Lich
HEALTH : 500 + 50% of maximum health
ATTACK : 4 + 25% of target's maximum health magic damage
This boss can be summoned by crafting and using Blood Heart.
Blood Lich will attack using ranged magic attacks.
When killed, she turns into a Crystal, and when you kill or right click on the Crystal, you can get a Crystal Core.
End Phoenix
HEALTH : 650 + 50% of maximum health
ATTACK : 10 + 130% of target's maximum health
This boss can be summoned by crafting and using Phoenix Egg.
End Phoenix will attack using dash and wide range attacks.
Fallen Angel Of Ashened
HEALTH : 750 + 50% of maximum health
ATTACK : 14 + 140% of taget's maximu health
This boss can be summoned by crafting and using Heart Of Heaven.
Fallen Angel Of Ashened will attack using greatsword and sword energy.
Existence Of BeyondHEALTH : 800 + 50% of maximum health
ATTACK : 12 + 140% of target's maximum health
This boss can be summoned by crafting and using Other Side.
Existence Of Beyond will attack using continuous dashes.
Lord
HEALTH : 1000 + 75% of maximum health
ATTACK : 4 + 160% of target's maximum health
This boss can be summoned by crafting and using Lord Assassination.
Lord will attack using dash and grab.
Lord is the strongest boss in this mod.
Reaper
HP : 1000 + 50% of maximum health
ATTACK : 12 + 150% of target's maximum health
This boss can be summoned by crafting and using Hollow Heart.
Reaper is the strongest boss in this mod.
Project description from CurseForge.
Pick your setup
EXTREME CORE by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.20.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
EXTREME CORE versions and loaders
extremecore-1.2.0-forge-1.20.1.jar
2 Aug 2026
extremecore-1.1.4-forge-1.20.1.jar
31 May 2026
extremecore-1.1.3-forge-1.20.1.jar
22 Nov 2025
extremecore-1.1.2-forge-1.20.1.jar
21 Nov 2025
extremecore-1.1.1-forge-1.20.1.jar
21 Nov 2025
extremecore-1.1.0-forge-1.20.1.jar
20 Nov 2025
extremecore-1.0.13-forge-1.20.1.jar
18 Nov 2025
extremecore-1.0.12-forge-1.20.1.jar
18 Nov 2025
extremecore-1.0.11-forge-1.20.1.jar
18 Nov 2025
extremecore-1.0.10-forge-1.20.1.jar
17 Nov 2025
extremecore-1.0.9-forge-1.20.1.jar
17 Nov 2025
extremecore-1.0.8-forge-1.20.1.jar
17 Nov 2025
Looking for an older file? The official CurseForge project page is in Resources.