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how to use adamantine forge bg3

Here’s a clear, step‑by‑step guide on how to use the Adamantine Forge in BG3 , plus some quick tips on choices, bugs, and “latest chatter” around it as of 2026.

How to Use Adamantine Forge BG3

Quick Scoop

The Adamantine Forge is a special crafting encounter in Grymforge that lets you turn rare Mithral Ore plus a mould into powerful adamantine gear—but you can only make two items per run, so your choices matter.

1. Getting to the Adamantine Forge

You’ll find the forge deep in Grymforge in the Underdark, reached via the Duergar boat from the Underdark Beach.

Basic route:

  1. Take the Duergar boat from Underdark Beach to Grymforge.
  1. Progress until you reach the rubble blocked by duergar and Rothé; either persuade the Rothé to clear it or blow it up.
  1. Past the rubble, solve the moving platform puzzle using nearby levers (ranged attacks or Mage Hand help).
  1. Climb down the iron ladder toward the Ancient Forge waypoint ; this leads directly to the Adamantine Forge arena.

Along the way, make sure you’re looting:

  • Weapon and armor moulds on corpses and around the machinery.
  • At least one piece of Mithral Ore from the mithral veins near lava pools close to the forge.

2. Core Materials You Need

To craft a single item, you must have:

  • 1 Mithral Ore (per item).
  • 1 mould (for the specific item you want, like armor, scimitar, shield, etc.).

Key constraints:

  • Grymforge only has two pieces of Mithral Ore , so you can only forge two items total.
  • There are six possible adamantine items, so you must prioritize wisely.

3. Step‑by‑Step: How to Operate the Forge

Once you’re on the circular forge platform near the Ancient Forge waypoint, the operation itself is quite simple.

  1. Insert the mould
    • Interact with the Mould Chamber.
    • Place your chosen mould (for example, shield, scale mail, scimitar, etc.).
  1. Load the Mithral Ore
    • Interact with the Crucible in the center of the platform.
    • Place one Mithral Ore inside.
  1. Lower the Forge
    • Use the Forge Lever on the southern side of the platform.
    • This lowers the entire platform down toward the lava and prepares the hammer.
  1. Open the Lava Valve
    • Use the Lava Valve to flood the channels around the platform with lava.
 * Lava will fill most of the lower ground; only raised dials and paths remain safe.
  1. Strike the mould
    • After lava is active and the forge is in position, use the Forge Lever again to have the hammer slam down on the mould.
 * When the animation finishes, loot the **completed adamantine item** from the Mould Chamber.

Practical tip: Don’t stand on the hammer path or near the impact when you pull the lever—the hit can basically one‑shot a character.

4. How to Beat Grym While Using the Forge

Your “first craft” doubles as a boss fight against Grym , an adamantine construct that activates when you run the forge with lava.

Key mechanics:

  • Grym is invulnerable until he’s superheated by lava.
  • Turning the Lava Valve makes Grym vulnerable; while superheated, he can take damage, especially from bludgeoning attacks and the forge hammer.

Common strategy:

  1. Start the forge properly
    • Insert mould + Mithral Ore.
    • Lower the forge with the lever.
    • Open the Lava Valve to bring up lava and awaken Grym.
  1. Lure Grym under the hammer
    • Keep one character near the Forge Lever.
    • Use another character to bait Grym into standing in the center, beneath the hammer.
  1. Drop the hammer on him
    • When Grym is standing under the hammer and superheated from the lava, pull the lever so the hammer smashes him.
 * Repeat if necessary until he dies; this can deal massive chunks of his health each time.
  1. Manage positioning
    • Spread your party on the raised pathways to avoid lava damage and Grym’s area attacks.
 * Avoid clustering so one swing or explosion doesn’t wipe your whole team.

If you don’t want to use the hammer, you can still beat him with bludgeoning weapons while he’s superheated, but it’s slower.

5. Can You Use the Adamantine Forge More Than Once?

Yes, the forge can be used multiple times up to your Mithral Ore limit, though some players report occasional bugs.

To use it again:

  1. Eject the old mould from the Mould Chamber, if needed.
  1. Insert a new mould.
  2. Put another Mithral Ore into the Crucible.
  3. Repeat the same lava + hammer process to craft your second item.

You are limited mainly by:

  • Only two Mithral Ore pieces in the area.
  • Once both are used, the forge can’t make more items in this playthrough.

Players sometimes mention bugs where the forge doesn’t reset properly, but the intended design is “two crafts maximum.”

6. What to Craft: Strategic Picks

With only two items possible, current community and guide discussions tend to favor high‑impact defensive or control pieces.

Commonly recommended choices (varies by party):

  • Adamantine Scale Mail – Great for front‑liners who need tankiness without full plate; good early‑game armor curve.
  • Adamantine Armor (Heavy) – Strong pick for a fighter/paladin type if you don’t already have great heavy armor lined up.
  • Adamantine Shield – Useful to make a tank character very hard to drop, synergizing with taunt/control builds.

A simple way to decide:

  • Melee‑heavy group: prioritise armor/shield for your main tank(s).
  • More casters/ranged: consider one big armor item and one offensive weapon mould for your main weapon user.

Here’s a compact look:

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Forge Aspect Key Details
Location Grymforge, reached via Duergar boat from Underdark Beach in the Underdark.
Required items 1 Mithral Ore + 1 mould per craft.
Crafting steps Insert mould → add Mithral Ore → pull Forge Lever to lower → open Lava Valve → hit with hammer → loot item.
Uses per playthrough Effectively 2 items, due to only two Mithral Ore nodes in Grymforge.
Grym fight tip Keep lava flowing to make Grym vulnerable, lure him under the hammer, and drop it while he is superheated.
Best uses of ore Often armor or shield for your main tank; remaining slot tailored to your party’s weapon needs.

7. “Latest News” & Forum‑Style Discussion Vibes

Even in 2025–2026 BG3 threads, players still talk about the Adamantine Forge as one of the most memorable Act 1 set‑pieces: a mix of environmental puzzle, boss arena, and limited‑resource crafting mini‑game. Guides and community posts often frame it as a “mini power spike” for your party, with lots of min‑max debates over which two items are optimal and posts lamenting a “wasted ore” on a less‑favored weapon mould.

A typical forum comment vibe goes something like:

“Realized too late there are only two ores—wish I’d gone double armor instead of that scimitar. Cool fight though, dropping the hammer on Grym never gets old.”

There’s also recurring chatter about minor bugs (like people thinking the forge is one‑time only when it’s actually the ore that’s limited) and players sharing creative “hammer‑kill” setups for Grym.

8. Quick TL;DR

  • The Adamantine Forge is in Grymforge , reached via the Duergar boat from Underdark Beach.
  • You need 1 Mithral Ore + 1 mould per craft, with only two ores available.
  • Operation: insert mould → add ore → lower forge → open lava → drop hammer → loot item.
  • Grym becomes vulnerable only when superheated by lava ; lure him under the hammer for huge damage.
  • Think carefully about which two items to craft; armor/shield picks for your main tank are popular recommendations.

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Learn how to use the Adamantine Forge in BG3: location, step‑by‑step forge operation, how to beat Grym, how many times you can use it, and which adamantine items to craft first.

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