The Adamantine Forge in Baldur's Gate 3 is a long-lost ancient forge that you can find in the heart of the Underdark area. You can use it to craft Rare and Very Rare-tier Adamantine armor and weapons.
However, getting it to work is just as confusing as finding it. That being said, if you're eager to craft some of the best early-game weapons and armor, you must learn to use this forge. As such, here's our guide, which explains how to use the Adamantine Forge in Baldur's Gate 3.
How to Craft Items With Adamantine Forge in Baldur's Gate 3
You need two items to use the Adamantine Forge. They are Mithril Ore and Mould. You can find a wide variety of Moulds in the Underdark. For example, the Mace Mould can be used to craft Adamantine Mace, whereas a Longsword Mould can be used to craft Adamantine Longsword.
Once you have these items, head to the Adamantine Forge and interact with the Mould Chamber to insert the Mould of your choice. Next, use the Crucible and insert a Mithril Ore. Once that's done, head over to the opposite end of the forge and pull the Forge Lever. Doing so will drop a hammer on the Crucible and bring the entire Forge down.
As soon as the Forge reaches the lower floor, interact with the Lava Valve to fill the entire area with hot oozing lava. Doing so will also bring out the gigantic robot called Grym. It's a tough boss, but you simply have to lure it under the Crucible and use the Forge Lever to trample it.
After you have defeated the boss, the Forge will be available to use. Just make sure to insert both the Mould and the Mithril Ore in their respective slots and then use the Forge Lever to drop down the hammer and craft the Adamantine gear.
And that's it! That concludes our guide on how to use the Adamantine Forge in Baldur's Gate 3.