GTBC's SpellLib/API
by GameTechBC
GTBC's SpellLib/API is a library for Iron's Spells 'n Spellbooks add-on developers, supplying shared spell attributes, particle managers and armor and curio classes.
What it does
Add-on developers often copy the same helper code between projects, and this library keeps those tools in one place. It requires Iron's Spells 'n Spellbooks, so that mod has to be installed alongside it. Files are published for Forge and NeoForge, covering 1.20.1 and 1.21.1, with 2.2.0 as the latest build for each loader and both released on 2026-09-06.
The library adds new spell attributes such as spell critical rate and damage, spell projectile damage and spell damage, along with many pre-made patterned particle managers. Client and server both need it, so the server and every player install the same build. It is released under All rights reserved, which means the code is not open source, and the author has said that an open-source release may be considered once the project has a longer track record in the modding scene.
Key features
Spell attributes
New attributes cover spell critical rate and damage, spell projectile damage and general spell damage for add-ons to use.
Random imbuing curios
The AdvancedRandomImbuingCurio class creates a curio that imbues itself with specified random spells on right-click.
Trade definitions
The AdvancedTrades class gives a simple way to define trades that can be adjusted in several ways.
Imbuable armor and Geckolib items
AbstractImbueableArmorItem offers customizable slots and pre-imbued spells, while GeoArmorItem and GeoMagicSwordItem add Geckolib models.
Spell animations and sounds
The AdvancedSpell class plays a random list of animations and sounds from cast start to finish, in either order.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: The library is aimed at developers making add-ons for Iron's Spells 'n Spellbooks. Players who only want to play with spells do not need it unless an add-on they install depends on it.
How it compares
More Spell Attributes [More Magic Series] is a Fabric and NeoForge library for 1.20.1 – 1.21.1 with client and server needs, released under the MIT License and not open source. More RPG Library covers Fabric, Forge and NeoForge for the same range, is open source under the MIT License and also needs client and server. KubeJS Iron's Spells is published for Forge and NeoForge across 1.19.2 – 1.21.1, is open source under the MIT License and runs on client and server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| GTBC's SpellLib/API | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-09-06 |
| More Spell Attributes [More Magic Series] | Fabric and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-01-30 |
| More RPG Library | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-10-11 |
| KubeJS Iron's Spells | Forge and NeoForge | 1.19.2 – 1.21.1 | Client and server | 2026-03-15 |
Questions
Does SpellLib/API need Iron's Spells 'n Spellbooks?
Which game versions does SpellLib/API support?
Does the server need SpellLib/API?
In the catalog
GTBC's SpellLib/API is one of 3,514 Library mods on ModsFinder, and one of 1,576 Library mods for Forge. 32,366 mods support Minecraft 1.21.1.
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What the author says
A new library/API mod for all of my Iron's Spellbooks Addons! This mod does not do ANYTHING on it's own!!
Official listing
- Modrinth page
- modrinth.com/mod/gtbcs-spelllib
- Owner
- GameTechBC
- Published
- 2026-08-04
- Updated on Modrinth
- 2026-09-06
- Facts verified
- 2026-10-15