Undermagic II
Progression expansion featuring flashy weapons, structures, and a challenging boss fight
Screenshots
About this Mod
Undermagic II is a datapack that expands the progression of the game with unique new gear and challenging boss fights. Inspired heavily by the Calamity Mod, this pack is a re-imagining of the original from 2019 and is currently in an early release state.
- Raid the Demonic Keeps, new Nether structures housing fearsome Demons
- 5 unique weapons: swords, spears, bows, and projectile melee for a wide variety of playstyles
- New armor set with unique properties
- Obtain items through expanded progression, from diamond sidegrades to new vanilla boss drops and beyond
- An intense boss battle against Demon General Maxon; intended to be challenging but fair, configurable via the world difficulty
- Complete in-game guidance via the Demonomicon (obtain by entering the Nether for the first time, or use /trigger um2.demonomicon to read)
This is an early release. There is much more to come, including both new and returning content...
Join my Discord server for discussion and any support needs. I love to hear what you have to say!
This pack uses the Smithed Crafter library by rx, Nexus, and many others. You do not need a seperate download, it's included in the files. Thanks to them!
Most textures are by Ragno. Thanks to her for the wonderful work!
This pack wouldn't be possible without the unending support of CreeperMagnet_ (who designed the logo), rx, Nexus, Delta, the rest of the Smithed community, and all my friends who keep me going. A heartfelt thanks to all of them :)
Available Versions
How to Install Undermagic II on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set datapack Loader
In the panel under "Egg", select the datapack loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "Undermagic II". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Undermagic II server crashes on startup – what to do?
Most common cause: wrong datapack version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is Undermagic II compatible with datapack and fabric and forge and neoforge and quilt?
Undermagic II officially supports datapack, fabric, forge, neoforge, quilt for Minecraft 1.21.11. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Undermagic II – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Undermagic II consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Undermagic II with just one click on your server.