During your adventures in the Underdark, you'll eventually come across a massive Duergar forge at its center. This forge is no ordinary forge and can craft some spectacular gear using the many moulds that can be found in the area surrounding it. However, due to the limited supply of ore necessary to make this gear, you'll need to be selective about which specific pieces you decide to make using the forge. If you're wondering which mould you should use at Grymforge, read on.
Best Gear From the Adamantine Forge in Baldur's Gate 3
In my playthrough, I took the time to make all of the available moulds to see if each would result in a different type of item. It turns out using the Adamantine Forge to craft any of the available weapons will result in a blue rarity variety of each respective weapon, each of which has the magical ability to Silence any target hit by it. These weapons are fairly powerful (especially with the Silence component attached), but they are hardly worth your Mithral ore, of which you only get two to use on the forge.
Armor fares better, though. If you use the medium armor mould, you'll get a solid medium armor chest piece likely to be an upgrade for one of your party members. However, the real prize is heavy armor. When the Splint mould is used at the forge, you're rewarded with the Very Rare Adamantine Splint Mail, which exceeds the stats of every other piece of gear you can make.
Yep, for some reason, using the Splint mould gives you the best possible gear you can get from the forge. If you use anything else, you won't get a Very Rare; it must be the Splint Mould.
So, that's one mould down; what about the others? As other moulds only reward Rare rarity gear that is only decent, I recommend saving the last Mithral ore in your possession and not crafting any other gear. In my playthrough, I haven't used the second one yet in hopes of discovering new moulds beyond the grasp of the immediate forge. So there you have it. Make the heavy armor, save the other. You're welcome.
Where to find Mithral Ore in BG3
As mentioned, you'll need Mithral Ore to make use of the forge. Thankfully, there are two pieces close to the forge, but you'll have to do a bit of exploration to get them, as they are far away from each other. Here are the locations:
So there you have it. You've got the moulds, and know where to find the ore. Now, make the heavy armor, save the other ore, just in case. You're welcome.
For more quality guides and useful information relating to Baldur's Gate 3, check out Fighter Build Guide – Best Skills and Subclass (BG3) right here on Pro Game Guides.