Just Boss Swords
Just a mod that lets you borrow the powers of the different boss
Screenshots
About this Mod
Have you ever wanted to use the different boss powers? If so Just Boss Sword is there!
Cosmic Sword (Warden)
You get the cosmic sword by being the first to pick up the dragon egg, but in this state the sword is incomplete. To unleash his full potential, you will need souls...
By killing a warden or a player, you increase the level of the sword by one.
- Lvl 0: Just a very good sword
- Lvl 1: Give you permanently the resistance II and strenght I effects when you hold it in any of your hands
- Lvl 2: When you right click, you do a sonic boom. It deals 5 hearts of damage no mather the armor and has a 1min30 cooldown.
*the listed effects stacks
Give command
Cosmic Sword:
/function jj_cosmic_sword:give/lv<swordLevel(0-2)>
Available Versions
How to Install Just Boss Swords 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 "Just Boss Swords". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.9 (+8 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Just Boss Swords 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 Just Boss Swords compatible with datapack and fabric and forge and neoforge and quilt?
Just Boss Swords officially supports datapack, fabric, forge, neoforge, quilt for Minecraft 1.21.11, 1.21.10, 1.21.9. 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 Just Boss Swords – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Just Boss Swords 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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Install Just Boss Swords with just one click on your server.