Spell Engine
Spell Engine is a data driven magic library that lets developers and players add spell casting, spell books and weapon-linked spells to Minecraft.
What it does
The library provides a complete spell casting system. Spells are defined in JSON, hot-reload without a restart and synchronize over the network, and they can be assigned to any weapon with automatic compatibility. Spell power comes from entity attributes, so damage scales with the caster's stats. Developers can also generate spells in code with SpellBuilder and SpellGenerator.
Spells have three types (active, passive and modifier), several cast modes including instant, charged and channeled, more than fourteen trigger types, and delivery methods such as projectiles, meteors, clouds and arrows. Projectiles can home, ricochet, bounce, pierce or chain. Equipment sets can grant spells, attributes and special abilities. Spell Engine is open source under the GNU General Public License v3.0 only.
The mod is published for Fabric, Forge and NeoForge across 12 release versions, 1.19 – 26.3, and runs on client and server. Fabric API, Cloth Config API, Curios API, Trinkets, playerAnimator and Spell Power Attributes are required. Forty-nine other catalog mods depend on it, including the RPG Series content mods, which come with melee attack skills assigned by default.
Key features
Data driven spells
Spells are written in JSON and can be assigned to any weapon, with spell power taken from entity attributes.
Melee attack skills
Melee skills are built for specific weapon types and use detailed collision detection, momentum, sliding and animations.
Projectile behaviour
Projectiles support homing, ricochet, bounce, pierce, chain reactions, divergence and custom hitboxes.
Cast modes and triggers
Spells can be instant, charged or channeled and fire on more than fourteen trigger types, with conditional logic.
Sounds and visuals
A sound system covers casting start and loop, release, impact and travel sounds with randomization.
Gallery
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x2 of 2 versions with builds
1.20.x2 of 2 versions with builds
1.19.x3 of 3 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 5
Required by 49 mods
Use cases
Custom spell packs
Modpack and content authors define new spells, weapon bindings and impact actions in JSON without writing Java code.
Spellcasting weapons
Weapon mods attach spells to their items through the spell container system, using tags, regex or exact matches.
Who it’s for: Mod developers building magic content and players who install RPG Series or other spell-based content mods that depend on the library.
How it compares
Spell Lib is a server-side library for Fabric, Forge, NeoForge and Quilt, published for 1.21.5 – 26.3, and is not open source. More Spell Attributes [More Magic Series] is client and server, licensed under the MIT License, and covers 1.20.1 – 1.21.1 on Fabric and NeoForge. Spells & Shields is client and server, open source under the MIT License, and covers 1.18.2 – 1.21.1 on Forge and NeoForge.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Spell Engine | Fabric, Forge and NeoForge | 1.19 – 26.3 | Client and server | 2026-10-03 |
| Spell Lib | Fabric, Forge, NeoForge and Quilt | 1.21.5 – 26.3 | Server required, client optional | 2026-10-10 |
| More Spell Attributes [More Magic Series] | Fabric and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-01-30 |
| Spells & Shields | Forge and NeoForge | 1.18.2 – 1.21.1 | Client and server | 2026-08-08 |
Questions
Which loaders does Spell Engine support?
Does Spell Engine need to be on the server?
Which dependencies must be installed with Spell Engine?
In the catalog
Spell Engine is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 8,071 mods support Minecraft 26.3.
More from ZsoltMolnarrr
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What the author says
SpellEngine is library mod (also known as an API) that lets developers create magic spells using, providing players with a complete spell-casting system including spell books, visual effects, and weapon integration. 🎁 Installation via Modrinth app is strongly recommended, to automatically resolve all required mods.
Official listing
- Modrinth page
- modrinth.com/mod/spell-engine
- Owner
- ZsoltMolnarrr
- Published
- 2023-01-12
- Updated on Modrinth
- 2026-10-03
- Facts verified
- 2026-10-15