# MagicItemReactionEffect

> Kinbarrow modding reference — content tree `4a103dcdb658a75a`, version `0.2.0+main.e011511f4`.

[Effects and mechanisms](https://kinbarrow.com/modding/latest/mechanisms.md)

Used by [MagicItem](https://kinbarrow.com/modding/latest/magic-item.md#magic-item-reaction-effect).

This is a nested shape inside a content file. The catalog explains context validation and links real RON examples.

Event-local result of accepting an active item's Reaction.

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## MagicItemReactionEffect::AcAgainstTrigger

Add AC only while resolving the triggering attack. It never becomes a persistent AC modifier and can turn that already-rolled hit into a miss.

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `bonus` | `int64` | required |  |

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## MagicItemReactionEffect::ReduceTriggerDamage

Reduce the triggering attack's composite initial damage by the rolled dice plus the bearer's named ability modifier, before resistance.

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `ability` | `Ability` | required |  |
| `catch_projectile` | `boolean` | default `false` |  |
| `count` | `uint8` | required |  |
| `faces` | `uint8` | required |  |


## Supporting shapes

- [Ability](https://kinbarrow.com/modding/latest/spell.md#ability)