Features:
- Library mod that provides a complete spell casting system
- Spell books, visual effects and weapon integration for players
- Melee weapon skills with detailed collision detection, momentum, sliding and animations
- Weapon skills assigned automatically by item id or item tag membership
- Spells can be assigned to any weapon with automatic weapon compatibility
- Spell damage is calculated from Spell Power entity attributes
- Spells written in JSON with hot-reloading and network synchronization
- Spell container system with proxy mode, equipment slots and dynamic spell resolution
- Active, passive and modifier spell types with instant, charged and channeled cast modes
- Over 14 trigger types plus Aim, Beam, Area, Caster and trigger-derived targeting
- Requires Cloth Config, Player Animator, Spell Power Attributes and the Curios API slot mod on NeoForge
- NeoForge support for Minecraft 1.21.1
Spell Engine is a library mod, effectively an API, that gives Minecraft a full spell casting system instead of a handful of fixed spells. Players get spell books, spell visual effects and magic that ties directly into the weapons they carry, while mod developers get the framework they would otherwise have to build from scratch. That is why a whole family of RPG content mods is built on top of it rather than reinventing casting logic each time.
One of the built-in layers is weapon skills. Each melee attack skill is designed around a specific weapon type and comes with detailed collision detection, momentum and sliding, plus its own animations. Skills are handed out automatically to vanilla and third-party weapons based on item id or item tag membership, and that mapping lives in a config file, so a pack can decide exactly which weapon swings which way.
The API itself is data driven. Spells are written in JSON, hot-reload while the game is running and synchronise over the network, and any of them can be attached to any weapon with compatibility handled automatically. Damage scales from Spell Power entity attributes. A spell container system with proxy mode, equipment slots and dynamic resolution decides which spells a player actually has access to, while universal pattern matching accepts tags, regular expressions and exact matches across spell properties. Mod developers can also generate spells programmatically through SpellBuilder and SpellGenerator.
Mechanically, spells come in three kinds: active spells that are cast, passive spells that trigger on their own, and modifier spells that alter other spells. Cast modes cover instant, charged and channeled casting with configurable haste effects, more than fourteen trigger types react to events such as melee hits, arrows, damage taken, evasion and rolls, and targeting ranges from aimed and beam to area, caster and trigger-derived. This build is a NeoForge release for Minecraft 1.21.1 at 4.42 MB, and it needs Cloth Config, Player Animator and Spell Power Attributes alongside it, plus the Curios API slot mod on NeoForge.
