If you want to successfully craft items in Baldur’s Gate 3’s Adamantine Forge, you’ll need to take down Grym the Adamantine Golem first. This boss is no pushover, with high health and a range of immunities and resistances. But fear not, there are tactics to make this fight easier, even on the challenging Honor Mode difficulty.
Encountered at the end of the quest to find and use the Adamantine Forge, Grym must be defeated before you can collect any items. The quest involves exploring the Grymforge, collecting gear molds, and Mithral Ore for the forging process. With limited resources, you can only craft two of the six different Adamantine Forge items.
When facing Grym, a strong party composition with mobile or tanking companions and ranged weapons is essential. Grym is immune to damage unless it has the Superheated debuff, which is applied when it’s in contact with lava. Flood the area with lava to maintain the debuff and use blunt weapons or the Forge Hammer to exploit its vulnerability to Bludgeoning damage.
To defeat Grym, lure it to the Crucible platform and trigger the Forge Hammer by interacting with the Forge Lever. This will deal immense Bludgeoning damage and knock Grym Prone, making it much easier to defeat.
Source: screenrant.com