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Libri Mutationis

by Sir_Potate

Libri Mutationis is a NeoForge magic mod that adds two books which change the player's size, gravity and speed.

NeoForgeClient and serverAll rights reserved1.21.8 – 1.21.11

What it does

The mod adds two new magic books that alter three attributes of the player: size, gravity and speed. A book works while the player holds it. The first book, Liber Mutatoris Mundi, changes the world. The second, Liber Mutatoris Galaxiae, changes the galaxy and is referred to as LMG. Its greater form, LMM, needs the first book to be made.

Only the client needs the mod for its effects to appear, but the server must run it as well, since the mod is set to client and server. Libri Mutationis is released under All rights reserved and is not open source. Files exist for NeoForge across four game versions, 1.21.8 – 1.21.11, with 1 for 1.21.11 as the latest file, published 2025-12-14.

Key features

  1. Size, gravity and speed

    Holding a book changes the player's size, gravity and speed at the same time.

  2. Two linked books

    The world book is needed before the galaxy book can be crafted, and the galaxy book leads to the greater form.

  3. Latin book names

    The books carry Latin titles, Liber Mutatoris Mundi and Liber Mutatoris Galaxiae, matching the mod's theme.

Compatibility

Latest build for each game version and loader.

1.21.111
1.21.101
1.21.91
1.21.81
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Questions

Which book must be made first?

Liber Mutatoris Mundi must be made first, because the galaxy book and the greater LMM form need it as an ingredient.

Does the server need Libri Mutationis?

Yes. A server running it needs every connecting player to have it too.

In the catalog

Libri Mutationis is one of 7,216 Magic mods on ModsFinder, and one of 2,992 Magic mods for NeoForge. 19,862 mods support Minecraft 1.21.11.

Magic mods7,216NeoForge modsMods for 1.21.1119,862

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What the author says

Hi, this mod adds two new books to the game, they both change 3 attributes of each individual player who holds them, Size, Gravity, and Speed. The first book is known as the Liber Mutatoris Mundi (The book of the world changer) and the second brings the Liber Mutatoris Galaxiae (The book of the galaxy changer), LMG…
Sir_Potate, on the Modrinth page

Official listing

Owner
Sir_Potate
Published
2025-12-14
Updated on Modrinth
2025-12-14
Facts verified
2026-10-15

Tags

EquipmentGame mechanicsMagicAdventure
Open on ModrinthCompare