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Adamantine Forge Guide: How to Use the Forge & Kill Grym (Baldur's Gate 3) — Baldur's Gate 3 video guide thumbnail
Baldur's Gate 3 Guide 4 min read

BG3: How to Use the Adamantine Forge & Kill Grym

How to use the Adamantine Forge and kill Grym in Baldur's Gate 3 — where to place moulds and Mithral, the Superheated trick, and the foolproof hammer strategy.

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Quick Answer

To use the Adamantine Forge, place a mould in the mould chamber and Mithral Ore in the crucible — this summons Grym, the Guardian of the Forge. Grym only takes (extra, bludgeoning) damage while Superheated, which means he must be standing in lava. Shoot the lava valve with a bow to flood the plate, aggro Grym onto the hammer plate (Gale works well), confirm he's Superheated, then shoot the lever to drop the forge hammer for massive damage. Repeat until he dies, then loot the Grymskull Helm and eject your mould.

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Crafting at the Adamantine Forge summons Grym, the Guardian of the Forge — a boss that shrugs off normal damage. Here’s how to set up the forge and kill him with his own hammer in seconds.

Short Answer

Place a mould in the mould chamber and Mithral Ore in the crucible to start crafting — this summons Grym, the Guardian of the Forge. Grym only takes (extra, bludgeoning) damage while Superheated, which requires him standing in lava. Shoot the lava valve with a bow to flood the plate, aggro Grym onto the hammer plate (Gale is a good lure), confirm he’s Superheated, then shoot the lever to drop the forge hammer for massive damage. Repeat until he dies, then loot the Grymskull Helm and remember to eject your mould.

Key Takeaways

  • Crafting needs 1 mould + 1 Mithral Ore: mould → mould chamber, ore → crucible.
  • Starting a craft summons Grym, the Guardian of the Forge.
  • Grym is only vulnerable while Superheated — he must stand in lava.
  • Shoot the lava valve to create lava; shoot the lever to drop the hammer.
  • Use Gale to pull aggro onto the hammer plate; keep archers free to hit the valve/lever.
  • After the fight, loot the Grymskull Helm and pull the mould lever to keep your mould.

How Do You Use the Adamantine Forge?

Insert a mould into the mould chamber and Mithral Ore into the crucible. Click the mould chamber and drag a mould from your inventory; click the crucible and drag in your Mithral Ore. Before you confirm, set up your party for the fight that’s about to start:

  • Healer (Shadowheart) near the mould chamber.
  • Mage (Gale) on the mould chamber so he draws Grym’s aggro.
  • Remaining characters to the side, where they can shoot the lever and lava valve with bows.

How Do You Kill Grym?

Make Grym Superheated by standing in lava, lure him onto the hammer plate, and drop the hammer on him. When the craft begins, Grym appears. He resists ordinary attacks — he only takes (and is weak to) bludgeoning damage while he has the Superheated status, and that only sticks while he’s standing in lava.

The loop:

  1. Shoot the lava valve with a bow to flood the plate with lava.
  2. Aggro Grym onto the hammer plate (Gale’s magic works as a lure).
  3. Hover over Grym to confirm he still has Superheated — if not, re-shoot the valve and wait a beat for it to apply.
  4. Shoot the lever to drop the forge hammer for massive bludgeoning damage.

Repeat the cycle and Grym falls fast. If your hammer hit does nothing, he wasn’t Superheated — make sure he’s actually in the lava.

Lava valve stuck or no lava? Re-shoot the valve and give the lava a moment to spread before checking the Superheated status; the effect applies a little after the lava appears.

How Do You Collect the Loot?

Loot Grym, then eject your mould. After the boss dies, clear the leftover mephits and loot Grym for the Grymskull Helm. Take your crafted Adamantine item from the forge, and pull the mould lever again to eject and recover your mould so you can reuse it.

Grym, the Eternal Protector of the Forge, with the Superheated status during the Adamantine Forge boss fight in Baldur's Gate 3.
Grym takes damage only while Superheated — keep him in the lava, then drop the hammer.

FAQ

How do you use the Adamantine Forge in Baldur’s Gate 3?

Put a mould in the mould chamber and Mithral Ore in the crucible, then start the craft. This also summons the boss, Grym, so prepare for a fight.

Why can’t I damage Grym?

Grym only takes meaningful damage while Superheated, which requires him to be standing in lava. Shoot the lava valve to create lava, then attack — ideally with the forge hammer (bludgeoning).

What is the hammer strategy for Grym?

Lure Grym onto the hammer plate while he’s Superheated, then shoot the lever to drop the hammer on him for huge bludgeoning damage. A few hits end the fight.

What do you do if the lava valve is stuck?

Re-shoot the valve with a bow and wait a moment — the Superheated status applies slightly after the lava spreads. Confirm the status on Grym before swinging the hammer.

What does Grym drop?

The Grymskull Helm. You also collect your crafted Adamantine gear from the forge.

Do you keep your mould after crafting?

Yes — pull the mould lever again after the craft to eject and pick the mould back up so you can use it again.

Sources

Fusion Thunder
Founder & Editor

I'm Fusion Thunder, the founder of Beyond Max Level. I'm a lifelong gamer and content creator who doesn't just play games — I like to push them to their absolute limits. This site is the written extension of my YouTube channel, @BeyondMaxLevel, where I break down the open-world epics and big RPGs worth going deep on into clear, no-fluff guides you can actually follow.

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