Ultra Hardcore Build for Minecraft 1.21.1
The most difficult modpack in all of Minecraft. And also the funniest!
About the Ultra Hardcore modpack
Due to many requests, we have published most of our modpacks on Modrinth. But keep the following in mind:
- There are many content and optimization mods that can't be added to Modrinth (they don't allow it).
- We are also unable to upload serverpacks here.
If you want to play with the full experience, we strongly recommend that you download the CurseForge version.

This modpack is the hardest you will ever play.
It is not a modpack designed to play a 1,000 hour game, it is to play 15, 20, 30 hours, whatever you can last... but keep in mind that at any moment you can die and lose all your progress.
There are two main features, the most important, you will only have one life, when you die the game will be over. But the most challenging is not that, the one that will really complicate the game is that you will not be able to regenerate hearts naturally, only by consuming golden apples, potions or similar.
Do you dare to defeat the dragon under these conditions? You won't be able to, or maybe you can?

Do you need a server to play with your friends?
If you are looking for a server to play any modpack with your friends, Bisect Hosting is your solution! They have the best quality-price Minecraft servers, and with the code "Lupin" you will receive a 25% discount.
The explanation for this modpack is simple, and can be summed up in one word, challenge. The goal is to make you have fun playing Minecraft again, living a completely renewed adventure, and suffering for not losing half a heart.
This is because the player will only have one life, and also, to complicate the situation even more, he will not be able to recover hearts.
Other complementary mods have been added, with the aim of improving the game experience, such as some animals, animations mods or small mods of biomes and structures, but yes, there will not be any mod that radically changes the game, for that there is the theme of the modpack itself.
Do you dare?
Minecraft keeps loading? You enter the world but your FPS is low?
### Please make sure to increase the RAM in case you need it, most problems are due to this. If you use the curseforge app, it's as easy as clicking on profile options, uncheck the option to use default memory system and move the bar to the right (at least we recommend 4GB or 4096 MB).
Is there an error with your server?
### Unfortunately, when setting up a server on your own, or hiring a hosting that I have not recommended, the modpack may not work.
All my modpacks work perfectly with Bisect Hosting, so I recommend 100% to hire such hosting. Also, you will get a 25% discount if you do it through this link and use the code "Lupin".
Please note that for this modpack, we recommend a minimum of 5GB of RAM. If you are a large number of players, you should consider increasing the amount of RAM even more.





How to install Ultra Hardcore
With Millida Launcher
Install Millida Launcher
The launcher is free: download it at millida.net/launcher and sign in with any nickname.
Click “Install” on this page
The launcher opens and installs the modpack for Minecraft 1.21.1 on NeoForge automatically.
Launch the game
A profile with it appears in the launcher: click “Play”.
Manually
Download the modpack archive
In the version list above, pick the file Ultra Hardcore - MC 1.21.1 - 12.0.0.mrpack (43 MB).
Import it into a launcher
A launcher that supports modpacks (Millida Launcher, Prism) takes the archive via “Add modpack”, then “From file”. No need to unpack it yourself.
Allocate memory
Modpacks need more memory than the plain game: set 4–6 GB in the profile settings.
On a server
Use the “To server” button
On Millida Hosting, the button at the top of the page uploads the file to your server and restarts it for you.
Invite friends: they install the same modpack
To join the server, every player needs the same modpack version.
Minecraft 1.21.1 runs on Java 21: with a different Java version the game may close right after launch.
Versions
With dependencies
| Minecraft | Loader | File | Date | Actions |
|---|---|---|---|---|
| 1.21.1 | NeoForge | 1.21.142.9 MB | ||
| 1.21.1 | NeoForge | 1.21.142.1 MB | ||
| 1.21.1 | NeoForge | 1.21.142.1 MB | ||
| 1.21.1 | NeoForge | 1.21.182.4 MB | ||
| 1.21.1 | NeoForge | 1.21.142.1 MB | ||
| 1.21.1 | NeoForge | 1.21.143.1 MB |
What it needs to run
- [EMF] Entity Model Featuresalready included
- ImmediatelyFastalready included
- Icebergalready included
- Dependencyalready included
- Dependencyalready included
- Just Enough Breeding (JEBr)already included
- MonoLibalready included
- XP Tomealready included
- TrimsEffectsalready included
- Dependencyalready included
- GuideMEalready included
- RightClickHarvestalready included
- Dependencyalready included
- Dependencyalready included
- Lootralready included
- Sodium Options APIalready included
- Diagonal Wallsalready included
- Resourceful Libalready included
- Better Third Personalready included
- Macaw's Fences and Wallsalready included
- Dependencyalready included
- Explorifyalready included
- Diagonal Fencesalready included
- Double Doorsalready included
- Dependencyalready included
- Loading Backgrounds - Oceansalready included
- Easy Anvilsalready included
- Farmer's Delightalready included
- Dependencyalready included
- Better GUIalready included
- Enchantment Descriptionsalready included
- YUNG's Better Desert Templesalready included
- Dependencyalready included
- Spyglass Improvementsalready included
- YUNG's Extrasalready included
- Dependencyalready included
- Mouse Tweaksalready included
- Medieval Buildings [End Edition]already included
- Dependencyalready included
- Macaw's Furniturealready included
- Supplementariesalready included
- Nature's Compassalready included
- Searchablesalready included
- Villager Namesalready included
- Redirectedalready included
- ElevatorModalready included
- Platformalready included
- Dependencyalready included
- MakeUp - Ultra Fastalready included
- sparkalready included
- AttributeFixalready included
- Stack Refillalready included
- Macaw's Trapdoorsalready included
- Jade 🔍already included
- Diagonal Windowsalready included
- Beautiful Enchanted Books [MOD EDITION]already included
- YDM's Weapon Masteralready included
- SuperMartijn642's Core Libalready included
- GlitchCorealready included
- Chunk Loadersalready included
- YUNG's Better Witch Hutsalready included
- FerriteCorealready included
- Sodium Extrasalready included
- Curios APIalready included
- Dependencyalready included
FAQ
Which Minecraft versions does Ultra Hardcore work on?
Only Minecraft 1.21.1: there are no files for other versions.
Is Ultra Hardcore for Forge or Fabric?
Only for NeoForge: 1.21.1.
Which mods are in the Ultra Hardcore modpack?
Mods in the modpack include [EMF] Entity Model Features, ImmediatelyFast, Iceberg, Dependency, Just Enough Breeding (JEBr), MonoLib, XP Tome, TrimsEffects and 45 more.
Which Java does Ultra Hardcore need?
Minecraft 1.21.1 runs on Java 21. If the game closes right after launch, the usual cause is the wrong Java version in the profile settings.
Where can I download Ultra Hardcore safely?
On this page: the file Ultra Hardcore - MC 1.21.1 - 12.0.0.mrpack (43 MB) is stored on Millida’s server, with no link shorteners. SHA-1 checksum: 535eb076ee6261e46ee54b04b6c596b8e7e2bfa6.
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