
Modrinth · Minecraft mod
Lost Libraries
Ancient libraries lay buried, forgotten by time. Magic books are abundant.
Quick answer
Which Lost Libraries release should I use?
Lost Libraries 1.1.2+mod targets 1.21, 1.21.1, 1.21.2 with Fabric, Forge, NeoForge. Installation on the client is optional. Installation on the dedicated server is optional. No extra mods listed for this file.
Where it goes
Is Lost Libraries required on the client, server, or both?
Installation on the client is optional. Installation on the dedicated server is optional.
The source marks this as usable on both the client and server.
What else does Lost Libraries 1.1.2+mod need?
1.1.2+mod. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Lost Libraries without breaking your instance.
Built for Lost Libraries 1.1.2+mod. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.1.2+mod. It targets 1.21, 1.21.1, 1.21.2 with Fabric, Forge, NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
Installation on the client is optional. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.1.2+mod. It opens that exact file at the source.
About this project
What does Lost Libraries add?

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
Project description from Modrinth.
Pick your setup
Lost Libraries by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.3
5 loader builds1.21.2
5 loader builds1.21.1
5 loader builds1.21
5 loader builds1.20.2
4 loader builds1.20.1
4 loader builds1.20
4 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Lost Libraries versions and loaders
1.1.2+mod
lost-libraries-1.1.2.jar
25 Jan 2025
1.1.2
lost.zip
25 Jan 2025
1.1.1+mod
lost-libraries-1.1.1.jar
26 Sept 2023
1.1.1
lost.zip
26 Sept 2023
1.1+mod
lost-libraries-1.1.jar
8 Aug 2023
1.1
lost 3.zip
8 Aug 2023
Looking for an older file? The official Modrinth project page is in Resources.