How to unlock the Adamantine Forge in Baldur's Gate 3

The Adamantine Forge is found near the end of the first act of Baldur's Gate 3, assuming you chose to travel through the Underdark to get to the Moonrise Towers, that is. If you went via the Mountain Pass instead, you won't find it naturally during your playthrough but you can go back that way if you want to see for yourself what's there...
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