The Adamantine Forge is a powerful crafting station located in the Grymforge region of the Underdark. By gathering specific moulds and Mithral ore, players can create high-quality weapons and armor. This process involves a challenging boss encounter against a guardian named Grym.
Understanding the Adamantine Forge Quest
The Adamantine Forge is a significant side quest in Baldur's Gate 3. Completing it requires players to piece together information scattered throughout the Underdark. According to collected guides, the quest involves locating three specific drow who hold secrets regarding the forge's operation.
To begin, you can visit the Myconid Colony in the Underdark. By investigating a hidden chamber near merchant Derryth Bonecloak—often concealed behind a blue bramble wall—you can find a corpse and a book titled "Lumph Mating Rituals." This book acts as an illusion, hiding the true subject: the Adamantine Forge. Using the "Speak with the Dead" spell on the Pale Corpse found here is another effective way to uncover early leads about the three drow and the forge’s purpose.
Gathering Information from the Drow
The three drow mentioned in the lore each provide a piece of the puzzle. Players should be prepared for combat, as these encounters are rarely peaceful.
- Filro the Forgotten: Located on a cliff west of the Sussur Tree, Filro is guarded by Hook Horrors. These enemies are dangerous because they can knock your party members off the cliffs. Defeating Filro allows you to loot his notes, which contain hints about the guardian of the forge.
- Dhourn: Found in the southeastern section of the Underdark, near the temple to Selune. He is trapped in a petrified state and guarded by a spectator. During the battle, the spectator will de-petrify statues, turning them into charmed allies. If you damage these drow, the charm breaks, and they may turn into neutral allies. After the fight, you can obtain a memory crystal from Dhourn to pinpoint the forge's location.
As a helpful tip, collecting items from these encounters—specifically the Icy Crystal, Icy Helve, and Icy Metal—allows you to craft the Mourning Frost quarterstaff, which is highly effective for spellcasters utilizing cold-based magic.
Reaching Grymforge
Once you have gathered the necessary information, you must travel to the Grymforge. The most common route involves taking the duergar boat from the southwest camp in the Underdark. You may need to have completed specific tasks, such as finding Thulla’s boots, to gain passage with Gekh Coal.
Upon arriving at Grymforge, you will navigate through a series of platforms to reach the forge itself. The path requires careful jumping and the use of levers to control moving platforms. Once your party is reunited at the teleport sigil near the forge site, look for a deposit of Mithral ore. You will need to destroy this deposit using weapons or magic to collect the raw materials required for crafting.
Activating the Forge and Defeating Grym
The forge operates using a specific sequence of actions. Once you have reached the central circular platform:
- Insert a mould into the chamber.
- Place the Mithral ore into the crucible.
- Pull the forge lever to lower the platform.
- Activate the valve to flood the forge with lava.
Filling the forge with lava triggers the appearance of the boss, Grym. This encounter is notoriously difficult due to Grym's high health and resistances. However, Grym is susceptible to the "Superheated" status effect when standing in lava, which reduces its resistances and makes it vulnerable to bludgeoning damage.
Strategy for the Boss Fight
To defeat Grym efficiently, utilize the environment. Grym will focus on the last character that attacked it. By positioning a character on the central crucible and another near the forge lever, you can bait the boss into the center. Once Grym is positioned directly under the massive hammer, pulling the lever will crush the creature, dealing significant damage. Note that the hammer impact removes the Superheated status, so you must re-apply lava to the forge if you need to use the hammer a second time.
Crafting Items
After Grym is defeated, you can use the forge lever to craft an item based on the mould you inserted. Players can return to the forge with additional Mithral ore to create more items without needing to fight Grym again. Common crafts include medium armor and shields, which are highly beneficial for specific character builds. For more information on optimizing your party for these encounters, consider reviewing our Baldur's Gate 3 builds or our Baldur's Gate 3 walkthrough.
Source-aware planning notes
Item guidance is most reliable when it records where the collected sources agree and leaves uncertain properties unfilled. Make a small checklist for the objective, compare the source wording, and avoid treating an attributed value, drop chance, or interaction as confirmed unless the snapshot supports it. Official updates can change item behavior, so preserve the date and re-check before relying on a detail in a new run. Use the article's headings as a worksheet: write down the confirmed premise, the next action, and the point at which you need to verify a newer source. This approach keeps the guide useful for a first pass while making its limits visible. It also prevents a concise community summary from being mistaken for a complete rulebook. When you adapt the advice to a different party, difficulty, platform, or patch, preserve the original wording and add your own observation separately. A careful note is more valuable than a confident detail that the collected evidence cannot support.
If you are keeping a run log, record the source date, the decision you made, and whether the result matched the description. That record gives you a reproducible way to revisit this topic after an update without rewriting an unsupported claim.
FAQ
Is it possible to use the Adamantine Forge more than once?
Yes. Once the initial encounter with the boss is completed, you can return to the forge with more Mithral ore and different moulds to craft additional pieces of equipment without triggering the boss fight again.
What is the purpose of the Mithral ore?
Mithral ore is the raw material required to craft weapons and armor at the Adamantine Forge. You must find it in the Grymforge area and place it in the crucible before activating the forge.
How do I make Grym vulnerable to damage?
Grym is resistant to most damage types unless it is affected by the "Superheated" status. This status is applied when the forge is filled with lava, making the boss vulnerable to bludgeoning damage and allowing it to be damaged by the forge hammer.