Lost Libraries Mod for Minecraft 1.21.1, 1.21
Lost Libraries lay deep below. What kind of treasures are down there?
Fabric
NeoForge
Forge
QuiltAncient libraries lay buried, forgotten by time. Magic books are abundant.
Features
New Structure: The lost library generates underground. It has a lot of bookshelves, maybe some are salvageable? Also has anvils, a lodestone, a smithing table, and a potion station.
Compatibility
Spawns using the #is_overworld tag, so should be compatible with anything. Uses stronghold library loot, so changing that will change the loot that appears in this structure.
REQUIRES COMMAND BLOCKS
How to install Lost Libraries
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 mod for Minecraft 1.21–1.21.4 on Fabric, Forge, NeoForge or Quilt automatically.
Launch the game
A profile with it appears in the launcher: click “Play”.
Manually
Install Fabric, Forge, NeoForge or Quilt
The loader must match the game version of the mod file, for example Minecraft 1.21.4. After installing it, a separate profile appears in your launcher.
Download the file for your version
In the version list above, pick the file lost-libraries-1.1.2.jar (31 KB) for your game version and loader.
Put it in the mods folder
The folder is inside .minecraft (Windows: %appdata%\.minecraft\mods). If it does not exist, create it.
Launch the loader profile
Open “Mods” in the main menu: Lost Libraries should be in the list.
Minecraft 1.21.4 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 | Fabric, NeoForge, Forge, Quilt | lost-libraries-1.1.2.jar31.1 KB |
FAQ
Which Minecraft versions does Lost Libraries work on?
There are files for 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21. The newest is 1.21.4.
Is Lost Libraries for Forge or Fabric?
There are files for Fabric: 1.21–1.21.4, for Forge: 1.21–1.21.4, for NeoForge: 1.21–1.21.4 and for Quilt: 1.21–1.21.4.
Does Lost Libraries need other mods?
The author lists no required dependencies: the Fabric, Forge, NeoForge or Quilt loader is enough.
Which Java does Lost Libraries need?
Minecraft 1.21.4 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 Lost Libraries safely?
On this page: the file lost-libraries-1.1.2.jar (31 KB) is stored on Millida’s server, with no link shorteners. SHA-1 checksum: f6cc23f4014b32f8ab80bd90fc8fce213abb4704.
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