Spell Schools API - More RPG Library

Overview

The More RPG Library extends Spell Engine’s spell school system with seven new schools: four magic schools, two ranged schools, and one melee school. Each school has unique power calculation formulas that combine different entity attributes.

Magic Spell Schools

Four elemental magic schools using the standard magic archetype.

Earth Magic

School ID: more_rpg_classes:earth Color: 0xbd8b00 (brown/gold) Archetype: MAGIC Source: MoreSpellSchools.java:17

Registration

public static final SpellSchool EARTH = SpellSchools.register(
    SpellSchools.createMagic("earth", 0xbd8b00)
);

Damage Type

DamageType

Uses standard magic damage scaling

Attribute

EntityAttribute

more_rpg_classes:earth_spell_power

Water Magic

School ID: more_rpg_classes:water Color: 0x4dd9ff (cyan/aqua) Archetype: MAGIC Source: MoreSpellSchools.java:18

Registration

public static final SpellSchool WATER = SpellSchools.register(
    SpellSchools.createMagic("water", 0x4dd9ff)
);

Air Magic

School ID: more_rpg_classes:air Color: 0xd4e3fe (light blue) Archetype: MAGIC Source: MoreSpellSchools.java:19

Registration

public static final SpellSchool AIR = SpellSchools.register(
    SpellSchools.createMagic("air", 0xd4e3fe)
);

Nature Magic

School ID: more_rpg_classes:nature Color: 0x43bf4b (green) Archetype: MAGIC Source: MoreSpellSchools.java:20

Registration

public static final SpellSchool NATURE = SpellSchools.register(
    SpellSchools.createMagic("nature", 0x43bf4b)
);

Ranged Spell Schools

Two ranged schools that combine ranged weapon attributes with elemental magic.

Frost Ranged

School ID: spell_power:frost_ranged Color: 0xccffff (light cyan) Archetype: ARCHERY Damage Type: ARROW Source: MoreSpellSchools.java:30

School Definition

public static final SpellSchool FROST_RANGED = new SpellSchool(
    SpellSchool.Archetype.ARCHERY,
    Identifier.of(SpellPowerMod.ID, "frost_ranged"),
    0xccffff,
    DamageTypes.ARROW,
    rangedDamageAttribute()
);

Power Calculation

Combines ranged damage with frost spell power:

Power Formula (MoreSpellSchools.java:53)

FROST_RANGED.addSource(SpellSchool.Trait.POWER, SpellSchool.Apply.ADD, query -> {
    var second_power = query.entity().getAttributeValue(SpellSchools.FROST.attributeEntry);
    return query.entity().getAttributeValue(rangedDamageAttribute()) + second_power;
});

Base Power

double

Ranged Weapon Damage (or Generic Attack Damage if Ranged Weapon API not installed)

Bonus Power

double

Frost Spell Power attribute value

Total Power

formula

rangedDamage + frostPower

Haste Calculation

If Ranged Weapon API is loaded:

Haste Formula (MoreSpellSchools.java:68)

FROST_RANGED.addSource(SpellSchool.Trait.HASTE, SpellSchool.Apply.ADD, query -> {
    var haste = query.entity().getAttributeValue(EntityAttributes_RangedWeapon.HASTE.entry);
    var rate = EntityAttributes_RangedWeapon.HASTE.asMultiplier(haste);
    return rate - 1;
});

Critical Strike

If Critical Strike API is loaded:

Critical Chance (MoreSpellSchools.java:83)

FROST_RANGED.addSource(SpellSchool.Trait.CRIT_CHANCE, SpellSchool.Apply.ADD, query -> {
    var value = query.entity().getAttributeValue(CriticalStrikeAttributes.CHANCE.attributeEntry);
    return (double) CriticalStrikeAttributes.CHANCE.asChance(value);
});

Critical Damage (MoreSpellSchools.java:87)

FROST_RANGED.addSource(SpellSchool.Trait.CRIT_DAMAGE, SpellSchool.Apply.ADD, query -> {
    var value = query.entity().getAttributeValue(CriticalStrikeAttributes.DAMAGE.attributeEntry);
    return CriticalStrikeAttributes.DAMAGE.asMultiplier(value) - 1;
});

Fire Ranged

School ID: spell_power:fire_ranged Color: 0xff3300 (red/orange) Archetype: ARCHERY Damage Type: ARROW Source: MoreSpellSchools.java:35

School Definition

public static final SpellSchool FIRE_RANGED = new SpellSchool(
    SpellSchool.Archetype.ARCHERY,
    Identifier.of(SpellPowerMod.ID, "fire_ranged"),
    0xff3300,
    DamageTypes.ARROW,
    rangedDamageAttribute()
);

Power Calculation

Combines ranged damage with fire spell power:

Power Formula (MoreSpellSchools.java:57)

FIRE_RANGED.addSource(SpellSchool.Trait.POWER, SpellSchool.Apply.ADD, query -> {
    var second_power = query.entity().getAttributeValue(SpellSchools.FIRE.attributeEntry);
    return query.entity().getAttributeValue(rangedDamageAttribute()) + second_power;
});

Base Power

double

Ranged Weapon Damage (or Generic Attack Damage if Ranged Weapon API not installed)

Bonus Power

double

Fire Spell Power attribute value

Total Power

formula

rangedDamage + firePower

Fire Ranged uses the same haste and critical strike calculations as Frost Ranged (see above).

Melee Spell Schools

Rage Melee

School ID: spell_power:rage_melee Color: 0xb3b3b3 (gray) Archetype: MELEE Damage Type: PLAYER_ATTACK Attribute: GENERIC_ATTACK_DAMAGE Source: MoreSpellSchools.java:41

School Definition

public static final SpellSchool RAGE_MELEE = new SpellSchool(
    SpellSchool.Archetype.MELEE,
    Identifier.of(SpellPowerMod.ID, "rage_melee"),
    0xb3b3b3,
    DamageTypes.PLAYER_ATTACK,
    EntityAttributes.GENERIC_ATTACK_DAMAGE
);

Power Calculation

Combines attack damage with the custom Rage modifier:

Power Formula (MoreSpellSchools.java:77)

RAGE_MELEE.addSource(SpellSchool.Trait.POWER, SpellSchool.Apply.ADD, query -> {
    return query.entity().getAttributeValue(EntityAttributes.GENERIC_ATTACK_DAMAGE) +
            ((query.entity().getAttributeValue(MRPGCEntityAttributes.RAGE_MODIFIER) - 100) / 10);
});

Base Power

double

Generic Attack Damage attribute

Rage Bonus

formula

(rageModifier - 100) / 10Where rageModifier is the Rage entity attribute value

Total Power

formula

attackDamage + ((rageModifier - 100) / 10)

Rage Scaling Example

At 100 Rage: +0 bonus damage
At 150 Rage: +5 bonus damage
At 200 Rage: +10 bonus damage

Haste

Haste Configuration (MoreSpellSchools.java:81)

SpellSchools.configureSpellHaste(RAGE_MELEE);

Uses standard spell haste configuration.

Critical Strike

If Critical Strike API is loaded, uses the same critical strike formulas as the ranged schools (see MoreSpellSchools.java:99-106).

Ranged Damage Attribute Helper

The schools use a helper method to determine the appropriate ranged damage attribute:

Attribute Selection (MoreSpellSchools.java:22)

private static RegistryEntry<EntityAttribute> rangedDamageAttribute() {
    if (FabricLoader.getInstance().isModLoaded("ranged_weapon_api")) {
        return EntityAttributes_RangedWeapon.DAMAGE.entry;
    } else {
        return EntityAttributes.GENERIC_ATTACK_DAMAGE;
    }
}

This ensures compatibility whether or not the Ranged Weapon API mod is installed.

Initialization

All spell schools must be initialized during mod startup:

Initialization (MoreSpellSchools.java:47)

public static void initialize() {
    SpellSchools.register(EARTH);
    SpellSchools.register(WATER);
    SpellSchools.register(AIR);
    SpellSchools.register(NATURE);
    
    // Configure power sources for ranged/melee schools
    // ... (power calculation setup)
    
    SpellSchools.register(FROST_RANGED);
    SpellSchools.register(FIRE_RANGED);
    SpellSchools.register(RAGE_MELEE);
}

Using Schools in Spells

Reference schools in your spell.json files:

Earth Magic Spell

{
  "name": "Stone Spear",
  "school": "more_rpg_classes:earth",
  "cost": 25,
  "impact": [
    {
      "action": {
        "type": "DAMAGE",
        "damage": 12
      }
    }
  ]
}

Frost Ranged Spell

{
  "name": "Ice Arrow",
  "school": "spell_power:frost_ranged",
  "cost": 15,
  "impact": [
    {
      "action": {
        "type": "DAMAGE",
        "damage": 8
      }
    },
    {
      "action": {
        "type": "STATUS_EFFECT",
        "effect": "more_rpg_classes:frosted",
        "duration": 60,
        "amplifier": 0
      }
    }
  ]
}

Rage Melee Spell

{
  "name": "Berserker Strike",
  "school": "spell_power:rage_melee",
  "cost": 20,
  "impact": [
    {
      "action": {
        "type": "DAMAGE",
        "damage": 15
      }
    },
    {
      "action": {
        "type": "CUSTOM",
        "custom": {
          "intent": "HARMFUL",
          "handler": "more_rpg_classes:knock_up"
        }
      }
    }
  ]
}

Trait System

Spell schools can have custom sources for various traits:

Available Traits

POWER

SpellSchool.Trait

Base damage/power of spells from this school

HASTE

SpellSchool.Trait

Casting speed modifier (values represent percentage increase)

CRIT_CHANCE

SpellSchool.Trait

Critical strike chance (0.0 to 1.0, where 0.2 = 20%)

CRIT_DAMAGE

SpellSchool.Trait

Critical damage multiplier bonus (where 0.5 = +50% crit damage)

Apply Methods

ADD

SpellSchool.Apply

Adds the source value to the trait

MULTIPLY

SpellSchool.Apply

Multiplies the trait by the source value

Creating Custom Schools

If you’re using More RPG Library as a dependency:

Custom Magic School

public static final SpellSchool SHADOW = SpellSchools.register(
    SpellSchools.createMagic("shadow", 0x4a0e4e)
);

Custom School with Trait Sources

public static final SpellSchool BLOOD_MELEE = new SpellSchool(
    SpellSchool.Archetype.MELEE,
    Identifier.of("yourmod", "blood_melee"),
    0x8b0000,
    DamageTypes.PLAYER_ATTACK,
    EntityAttributes.GENERIC_ATTACK_DAMAGE
);

BLOOD_MELEE.addSource(SpellSchool.Trait.POWER, SpellSchool.Apply.ADD, query -> {
    // Power increases as health decreases
    var entity = query.entity();
    var missingHealthPercent = 1.0 - (entity.getHealth() / entity.getMaxHealth());
    return entity.getAttributeValue(EntityAttributes.GENERIC_ATTACK_DAMAGE) * missingHealthPercent;
});

Integration Notes

The ranged schools automatically detect and integrate with:

Ranged Weapon API - for ranged damage and haste attributes
Critical Strike API - for crit chance and damage

If these mods are not installed, the schools gracefully fall back to vanilla attributes.

Spell schools must be registered during mod initialization, before any spells are loaded.

Use the hybrid schools (Frost Ranged, Fire Ranged, Rage Melee) to create builds that combine multiple playstyles and attribute types.

​Overview

​Magic Spell Schools

​Earth Magic

​Water Magic

​Air Magic

​Nature Magic

​Ranged Spell Schools

​Frost Ranged

​Power Calculation

​Haste Calculation

​Critical Strike

​Fire Ranged

​Power Calculation

​Melee Spell Schools

​Rage Melee

​Power Calculation

​Rage Scaling Example

​Haste

​Critical Strike

​Ranged Damage Attribute Helper

​Initialization

​Using Schools in Spells

​Trait System

​Available Traits

​Apply Methods

​Creating Custom Schools

​Integration Notes

Overview

Magic Spell Schools

Earth Magic

Water Magic

Air Magic

Nature Magic

Ranged Spell Schools

Frost Ranged

Power Calculation

Haste Calculation

Critical Strike

Fire Ranged

Power Calculation

Melee Spell Schools

Rage Melee

Power Calculation

Rage Scaling Example

Haste

Critical Strike

Ranged Damage Attribute Helper

Initialization

Using Schools in Spells

Trait System

Available Traits

Apply Methods

Creating Custom Schools

Integration Notes