Lost Libraries

Ancient libraries lay buried, forgotten by time. Magic books are abundant.

59.0K Downloads

datapackfabricforgeneoforgequiltadventureworldgen

Rent Server with this Mod

Screenshots

About this Mod

Lost Library

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

Available Versions

1.1.2release

MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4fabric, forge, neoforge, quilt

January 25, 2025

1.1.2release

MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4datapack

January 25, 2025

1.1.1release

MC 1.20, 1.20.1, 1.20.2fabric, forge, quilt

September 26, 2023

1.1.1release

MC 1.20, 1.20.1, 1.20.2datapack

September 26, 2023

1.1release

MC 1.20, 1.20.1fabric, forge, quilt

August 8, 2023

How to Install Lost Libraries on Your Server

Order Server

Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).

Set datapack Loader

In the panel under "Egg", select the datapack loader and matching Minecraft version (1.21.4).

Install Mod

Open the mod browser in the dashboard and search for "Lost Libraries". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

datapackfabricforgeneoforgequilt

Minecraft Versions

1.21.4, 1.21.3, 1.21.2 (+5 more)

Server-side

✓ Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

Lost Libraries 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 4 GB RAM is allocated and the loader matches the mod version (1.21.4). You can switch loaders with one click in the panel.

Is Lost Libraries compatible with datapack and fabric and forge and neoforge and quilt?

Lost Libraries officially supports datapack, fabric, forge, neoforge, quilt for Minecraft 1.21.4, 1.21.3, 1.21.2. 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 Lost Libraries – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Lost Libraries 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.