Builder’s Gate

Updated 2026-09-27

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Thermodynamo Axe is an item of Rare rarity. Type: Battleaxe · Martial Weapon. Damage: 1d8 Slashing. Recorded sources: Act 2 · Last Light Inn · Purchase · Dammon; Found in the world (unconfirmed). See acquisition details below for conditions. Weight 1.8, Value 310 gold. Passives: Thermodynamo. Granted abilities: Maiming Strike, Lacerate, Cleave.

Thermodynamo Axe

Rare

Battleaxe · Martial Weapon

1d8 Slashing

Weapon Enchantment +1

Thermodynamo: Whenever you deal damage with this weapon, you gain 2 turns of Heat.

Maiming Strike Action Lacerate Action Cleave Action

Designed by gnomish innovation, this weapon has a dynamic core that swivels and tinkles into life whenever the axe is swung at a foe.

How to obtain

Act 2 Purchase Last Light Inn Dammon

Found in the world *

1.8310

Effect

Heat

Heat deals Fire damage to its bearer, but Heat Convergence can spend it to improve subsequent Fire damage.

Stage 3 · Combining effectsEquipment and stacking

With Heat Convergence enabled, the remaining Heat is consumed to add Fire damage. Merely gaining Heat does not guarantee the same bonus on every attack.

The self-damage is real and can threaten Concentration. Consider how you gain Heat, what will spend it, and how you will handle the damage you take.

Sources and review date

Reviewed: 2026-09-14

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

Answer

Heat Application

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

Based on in-game text

Trigger source

Thermodynamo

Whenever you deal damage with this weapon, you gain 2 turns of Heat.
Trigger context
OnDamage
Applies to
Self
Application condition
AttackedWithPassiveSourceWeapon()
Application chance
100%
Application duration
2 turns

    Answer

    Heat Stack Effect

    Heat does not add a separate roll modifier per stack; its stacks are tied to using Heat Convergence.

    Derived from game data
    Roll example
    Trigger threshold not implemented. Deals 1d4 Fire damage when triggered.
    Game status key
    MAG_FIRE_HEAT

    In-game text

    Engulfed by a vengeful fire. Takes 1d4 Fire damage each turn, but can use Heat Convergence.

      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

      Heat 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_FIRE_HEAT

      In-game text

      Engulfed by a vengeful fire. Takes 1d4 Fire damage each turn, but can use Heat Convergence.

        Answer

        Heat Consumption and Damage

        The conditions for consuming Heat and the Fire damage it deals are specified in the game data below.

        Derived from game data
        Threshold
        The game data does not specify a numeric threshold.
        At the threshold
        1d4 Fire
        Roll example
        Trigger threshold not implemented. Deals 1d4 Fire damage when triggered.
        Game status key
        MAG_FIRE_HEAT

        In-game text

        Engulfed by a vengeful fire. Takes 1d4 Fire damage each turn, but can use Heat Convergence.

          Answer

          Using Heat

          Use Heat Convergence to add Fire damage, while accounting for the damage Heat itself deals and the consumption condition.

          Codex commentary
            Technical details — 3 effects without commentary

            MAG_FIRE_HEAT_CHARGE_UP_TECHNICAL, MAG_Fire_HeatOnWeaponDamage_Passive, MAG_FIRE_HEAT_ONCE_TECHNICAL

            Equip in build2 available slots — opens the first slot

            Other items: Battleaxe