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

🎁 Installation via Modrinth app is strongly recommended, to automatically resolve all required mods.

Required

• Cloth Config
• Player Animator
• Spell Power Attributes

Additionally on Fabric:

• Fabric API
• slot mod: Trinkets

Additionally on NeoForge:

• slot mod: Curios API

⭐️ Content made with Spell Engine

🤝 Made by partners

📦 Built-in content

🗡️ Weapon skills 🪓

Explore a variety of melee attack skills, each of them designed for a specific weapon type, with unique features:

• detailed collision detection
• momentum and sliding
• fancy animations

RPG Series content mods come with these skills assigned by default.

Automatically assigned to third-party and vanilla weapons, based on item id or item tag membership. (Config file: config/spell_engine/weapon_fallback.json)

🪄️ API Features

Data driven API

• 🗡️ Spells can be assigned to any weapon (data driven with automatic weapon compatibility)
• 🔮 Spells deal damage based on Spell Power entity attributes
• ✍️ Spells defined in JSON format with hot-reloading and network synchronization
• 📦 Spell Container System with proxy mode, equipment slots, and dynamic spell resolution
• 🔄 Universal pattern matching for tags, regex, and exact matches across all spell properties
• 🛠️ Programmatic spell generation with SpellBuilder and SpellGenerator for mod developers
• ⚙️ Spells have a comprehensive set of mechanical behaviours:
  • Spell Types: Active (casted), Passive (triggered), Modifier (spell-modifying)
  • Cast Modes: Instant, charged, channeled, with configurable haste effects
  • Trigger System: 14+ trigger types (melee, arrow, spell, damage, evasion, roll, etc.) with conditional logic
  • Targeting: Aim, Beam, Area, Caster, None, FromTrigger - with caps, conditions, and health-based limits
  • Delivery: Direct, Projectile, Meteor, Cloud, ShootArrow, StashEffect, Custom - with delays and multi-placement
  • Projectile Features: Homing, ricochet, bounce, pierce, chain reactions, divergence, custom hitboxes
  • Impact Actions: Damage, Heal, StatusEffect, Fire, Teleport, Spawn, Cooldown, Aggro, Custom
  • Conditional Logic: Target modifiers, impact filters, chance-based execution, entity type conditions
  • Cost System: Exhaust, items/runes, cooldowns, durability, status effect consumption, with batching
  • Equipment Sets: Set bonuses providing spells, attributes, and special abilities

Fancy audio and visuals

• 🔈 Advanced sound system: casting start/loop, release, impact, travel sounds with randomization
• ✨ Sophisticated particle system with shapes, entity following, scaling, and custom magical particles
• 🎨 Custom Item/Block models for projectiles, status effects, and spell clouds with BlockBench support
• 🤸 Player animations at all spell stages with pitch control and ranged weapon animation support
• 💡 Dynamic lighting integration (LambDynamicLights) for magical illumination
• 🌈 Customizable beam rendering with colors, textures, width, and flow effects
• 📍 Area effect visualization with ground indicators and range-scaled particles

In game features

• 🔧 Spell selection and casting visible on HUD (fully player configurable)
• 😌 QoL features: automatic spell cast release, client prediction, smart targeting
• ⛓️ Spell Binding Table for adding spells to weapons and creating spell books
• 📜 Spell Scroll system with creative tab generation and dungeon loot integration
• 🎒 Equipment integration: Spell books, trinket slots (Trinkets/Accessories), automatic weapon detection
• ⚡ Spell Infinity enchantment with configurable item tag support
• 🎮 Commands: /spell_cooldowns for server administration and debugging
• 💰 Advanced loot system with spell_bind_randomly function for dynamic spell assignment

Developer & Mod Integration

• 🔌 Extensive mod compatibility: Better Combat, Combat Roll, FTB Teams, Shoulder Surfing, and more
• 📊 Comprehensive event system for spell casting, healing, and projectile lifecycle
• 🏗️ Custom handler registration for delivery methods and impact actions
• 🎯 Entity predicate system for complex targeting conditions
• 🔧 Performance optimizations: batching, scheduling, client-side prediction
• 📝 Data generation framework for programmatic spell creation and validation
• 🌐 Multi-platform support (Fabric & NeoForge) with unified API