Builder’s Gate

Updated 2026-09-27

한국어

Hat of Fire Acuity is an item of Uncommon rarity. Type: Helms. Recorded sources: Act 2 · Last Light Inn · Found in the world. See acquisition details below for conditions. Weight 0.5, Value 90 gold. Passives: Fire Acuity.

Hat of Fire Acuity

Uncommon

Fire Acuity: Whenever you deal Fire damage, you gain Arcane Acuity for 2 turns.

It is said some wizard hats grant the power to keep your head cool - both literally and figuratively.

How to obtain

Act 2 Found in the world Last Light Inn

0.590

Related creatures1

Effect

Arcane Acuity

Arcane Acuity increases spell attack rolls and spell save DC according to its remaining stacks.

Stage 3 · Combining effectsEquipment and stacking

If your equipment grants stacks from weapon attacks, attacking before casting can help. The action that grants stacks depends on the item.

Taking damage reduces its remaining duration. Even after building stacks, being hit before casting can reduce the bonus.

Sources and review date

Reviewed: 2026-09-14

Derived from game data
  • Attack
  • Multi-hit
Effect permalink

Core rule

Attack rolls

Core rule permalink

An attack roll decides whether an attack hits. The total must meet or exceed the target’s Armour Class.

Stage 1 · Combat basicsAttacks and dice

Roll a d20 and add the applicable ability modifier, proficiency bonus, and other attack bonuses. The weapon or spell determines which ability applies.

Damage is calculated after the hit is decided. A larger attack-roll total does not itself deal more damage.

Sources and review date

Reviewed: 2026-09-14

Based on in-game text
  • Attack
  • Defense

Core rule

d20 rolls

Core rule permalink

A d20 has twenty possible results, from 1 to 20. It is used to resolve attacks and many uncertain actions.

Stage 1 · Combat basicsAttacks and dice

Add the relevant ability modifier, proficiency, and other bonuses to the die. Meeting the target number is enough to succeed.

Attack rolls, saving throws, and ability checks use different bonuses. A bonus to one does not automatically apply to the others.

Sources and review date

Reviewed: 2026-09-14

Based on in-game text
  • Attack
  • Defense

Core rule

Saving throws

Core rule permalink

A saving throw determines whether you resist or avoid a harmful effect, such as a spell or trap.

Stage 1 · Combat basicsAttacks and dice

Roll a d20 using the ability named by the effect, then add the relevant modifier and saving-throw bonuses. Meeting the Difficulty Class succeeds.

Success may mean half damage or avoiding the effect entirely. A successful save does not always mean zero damage.

Sources and review date

Reviewed: 2026-09-14

Based on in-game text
  • Defense

Answer

Arcane Acuity Application

When an item's specified trigger is met, it applies Arcane Acuity.

Based on in-game text

Trigger source

Fire Acuity

Whenever you deal Fire damage, you gain Arcane Acuity for 2 turns.
Trigger context
OnDamage
Applies to
Self
Application condition
IsDamageTypeFire() and not Self()
Application chance
100%
Application duration
2 turns

    Answer

    Arcane Acuity Stack Adjustment

    Each remaining stack grants a bonus to spell Attack Rolls and spell Difficulty Class.

    Derived from game data
    How stacks work
    The remaining stacks affect this effect.
    Roll example
    The effect increases by 1 per stack.
    Game status key
    MAG_GISH_ARCANE_ACUITY

    In-game text

    Affected entity has a +1 bonus to its spell Attack Rolls and spell Difficulty Class for each remaining turn.

    Reduce the duration by 2 each time the entity takes damage.

      Core rule

      Stacking

      Core rule permalink

      Repeated effects may grow stronger, last longer, replace one another, or fail to combine.

      Stage 3 · Combining effectsEquipment and stacking

      For conditions such as Radiating Orb, remaining turns also affect strength. In contrast, repeated resistance does not keep halving damage.

      Check whether the effect stacks and whether it has a cap. A shared display name does not mean the values from every variant can be added together.

      Sources and review date

      Reviewed: 2026-09-14

      Derived from game data
      • Multi-hit

      Answer

      Arcane Acuity Duration

      The game data below distinguishes an entry's listed duration from the duration actually applied.

      Derived from game data
      Status duration
      2 turns
      Game status key
      MAG_GISH_ARCANE_ACUITY

      In-game text

      Affected entity has a +1 bonus to its spell Attack Rolls and spell Difficulty Class for each remaining turn.

      Reduce the duration by 2 each time the entity takes damage.

        Answer

        Using Arcane Acuity

        After building it up, use it with spells that use spell Attack Rolls or require Saving Throws; also account for its duration being reduced when the bearer takes damage.

        Codex commentary

          Equip in build

          Other items: Helms