Librarian's Balance Data Pack (1.21.11, 1.20.1) – Custom Trading and New Mechanics
Java data pack listed for Minecraft 1.20–1.21. Downloads from the MC Java Mods app on Android.
Librarian's Balance Data Pack is a datapack or mod that enhances the progression of obtaining enchantments from villagers. It introduces a system where…
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Librarian’s Balance Data Pack is a datapack or mod that enhances the progression of obtaining enchantments from villagers. It introduces a system where librarians can resell duplicate enchanted books that the player already owns, creating a more balanced and progressive approach to enchantment trading.
Normally, players need two identical enchanted books to upgrade an enchantment level in an anvil. With this datapack, librarians now sell duplicates of your owned books in exchange for emeralds. By combining these books in an anvil, players can upgrade enchantments step by step, from Level 1 to Level 5, through trading and experience investment rather than relying solely on random trades.
The maximum random enchanted book level offered by new librarians is limited to Level 3, encouraging players to use the new trading mechanic for higher levels.
Features:
- Customisable Trades: Place an enchanted book on a librarian’s lectern to change their first or second trade to match that book. This gives purpose to found books. Treasure enchantments produce sealed, untradable variants when traded this way.
- Limited Random Trades: Random librarian trades go only up to Level 3. To obtain Level 4 or 5, use the custom trade mechanic – purchase a duplicate, combine it in an anvil, and reinsert it into the trade cycle.
- Rare Mending: Librarians cannot trade Mending by default. Players must first find it in End Cities or Ancient Cities (similar rarity to armor trims). Once found, it can be traded via the lectern system.
Configuration: Use the command /function libal:config (requires OP) to toggle or configure all features. To disable loot table changes, delete the loot_table folder inside the datapack.
Usage: Ideal for survival multiplayer servers where enchantment progression feels too fast. This system balances progress using experience, emeralds, and exploration.
Compatibility: Works with the Amendments mod and fully supports the Tome Reader mod (1.21-1.21.1), which improves book placement and enchantment transfer. Compatible with Mojang’s Villager Rebalance experimental feature (not required).
Notes:
- Occasional UI glitches may display invalid trades (e.g., Mending or >Level 3). These are visual only.
- If issues occur, run
/function libal:loadto refresh the datapack. - Ensure the datapack is not unzipped in the folder.
Screenshots:
Librarian’s Balance Data Pack Download Links
For All Versions from Minecraft 1.17.1 to Minecraft 1.19.4
For Minecraft 1.20.1, 1.20
For Minecraft 1.20.4, 1.20.2
For Minecraft 1.20.6
For Minecraft 1.21.1, 1.21
For Minecraft 1.21.4
For Minecraft 1.21.5
For Minecraft 1.21.8, 1.21.7, 1.21.6
For Minecraft 1.21.10, 1.21.9
For Minecraft 1.21.11
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.11, 1.20.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: In MC Java Mods, or directly above on this page.
Install steps are the general flow for this file type — see the MC Java Mods guides for the full walkthrough.
- Download size: 25 KB
- Download link checked 17 Jun 2026 — working
- Mirrored on our own servers — the download does not depend on the original host
These come from our own check of the pack file, not from the source page.