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More RPG Library provides a collection of custom spell impacts that extend Spell Engine’s functionality. These impacts allow you to create more dynamic and engaging spell effects.

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Adding Custom Impacts to Spells

Custom impacts are added to your spell.json files using the CUSTOM action type: 
"impacts": [
  {
    "action": {
      "type": "CUSTOM",
      "custom": {
        "intent": "HARMFUL",
        "handler": "more_rpg_classes:knock_up_fixed"
      }
    }
  }
]
The intent field can be either "HARMFUL" or "HELPFUL" depending on the nature of your spell impact.

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Available Custom Impacts

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Movement & Knockback

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Knock Up (Fixed)

Handler: more_rpg_classes:knock_up_fixed Knocks the target upward with a fixed height of 0.75 Y-velocity and applies slow falling.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HARMFUL",
      "handler": "more_rpg_classes:knock_up_fixed"
    }
  }
}

​
Knock Up (Scalable)

Handler: more_rpg_classes:knock_up Knocks the target upward with a scalable height based on spell configuration.

​
Range Scaled Knockback

Handler: more_rpg_classes:range_scaled_knockback The closer the target is to the caster, the higher the knockback value.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HARMFUL",
      "handler": "more_rpg_classes:range_scaled_knockback"
    }
  }
}

​
Pull & Push

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Pull to Caster (Direct)

Handler: more_rpg_classes:pull_to_caster_direct Pulls the target directly in front of the caster instantly.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HARMFUL",
      "handler": "more_rpg_classes:pull_to_caster_direct"
    }
  }
}

​
Pull to Caster (Slow)

Handler: more_rpg_classes:pull_to_caster_slow Pulls the target slowly toward the caster. Ideal for channeled spells.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HARMFUL",
      "handler": "more_rpg_classes:pull_to_caster_slow"
    }
  }
}
Use the slow pull variant with channeled spells to create effects like pulling enemies while maintaining the spell.

​
Dash & Rush

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Backward Dash (Fixed)

Handler: more_rpg_classes:backward_dash_fixed The caster dashes backward for a fixed distance.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HELPFUL",
      "handler": "more_rpg_classes:backward_dash_fixed"
    }
  }
}

​
Backward Dash (Range Scaled)

Handler: more_rpg_classes:backward_dash_range The caster dashes backward. Distance is scaled with the range value in your spell.json.

​
Forward Dash (Range Scaled)

Handler: more_rpg_classes:forward_dash_range The caster dashes forward. Distance is scaled with the range value in your spell.json.

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Rush Forward to Target

Handler: more_rpg_classes:rush_forward_to_target The caster travels quickly toward the target.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HELPFUL",
      "handler": "more_rpg_classes:rush_forward_to_target"
    }
  }
}

​
Elemental Effects

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Lightning Strike

Handler: more_rpg_classes:lightning Summons a friendly lightning entity at the target’s location that won’t damage allies.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HARMFUL",
      "handler": "more_rpg_classes:lightning"
    }
  }
}

​
Frozen Ticks

Handler: more_rpg_classes:frozen_ticks Adds frozen entity ticks to the target.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HARMFUL",
      "handler": "more_rpg_classes:frozen_ticks"
    }
  }
}

​
Special Effects

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Damage According to Missing Health

Handler: more_rpg_classes:damage_according_to_missing_health Deals damage based on the target’s missing health percentage:
  • Above 50% health: 0.25x multiplier
  • Under 50% health: 1.0x multiplier
  • Under 25% health: 1.75x multiplier
Damage is calculated using: Spell School Attribute * Missing Health Multiplier
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HARMFUL",
      "handler": "more_rpg_classes:damage_according_to_missing_health"
    }
  }
}
This impact is particularly effective as an execute ability against low-health targets.

​
Trembling

Handler: more_rpg_classes:trembling Throws the target around in random directions, creating a disorienting effect.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HARMFUL",
      "handler": "more_rpg_classes:trembling"
    }
  }
}

​
Stop Arrows

Handler: more_rpg_classes:stop_arrows Checks for arrows and sets their velocity to 0, effectively stopping them mid-flight.
spell.json
{
  "action": {
    "type": "CUSTOM",
    "custom": {
      "intent": "HELPFUL",
      "handler": "more_rpg_classes:stop_arrows"
    }
  }
}

​
Combining Multiple Impacts

You can combine multiple impacts in a single spell for complex effects:
spell.json
"impacts": [
  {
    "action": {
      "type": "DAMAGE",
      "damage": 10
    }
  },
  {
    "action": {
      "type": "CUSTOM",
      "custom": {
        "intent": "HARMFUL",
        "handler": "more_rpg_classes:knock_up_fixed"
      }
    }
  },
  {
    "action": {
      "type": "CUSTOM",
      "custom": {
        "intent": "HARMFUL",
        "handler": "more_rpg_classes:lightning"
      }
    }
  }
]
Experiment with combining movement impacts (like dashes) with damage or elemental effects to create unique spell mechanics.

​
Implementation Reference

All custom impacts implement the SpellHandlers.CustomImpact interface and can be found in: 
net.more_rpg_classes.custom.spell_impacts
See the source code for implementation details and configuration options.

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