Baldur's Gate 3 has a boss in the Underdark located in a place called the Adamantine Forge which is extremely difficult to beat and can result in a lot of TPKs. If you beat that boss though, and bring the correct items to the Forge, then you can make multiple different items which will have incredible boosts for your party over the course of the rest of the game. We've got the full list of all items and what they do, so you can decide what to spend your hard-earned metal on.
All Adamantine Forge Items
- Adamantine Longsword - Versatile Hitter (Gives your opponent the Reeling condition, causing them to have a -1 penalty to every attack roll until the condition ends)
- Adamantine Mace - Swift Hitter (Cause an opponent to gain the Reeling condition for one turn)
- Adamantine Scimitar - Swift Hitter (Causes an opponent to gain the Reeling condition for one turn)
- Adamantine Scale Mail - Reduce all damage from attacks by 1, and the wearer of the armor cannot be critically hit
- Adamantine Splint Armour - Reduces all incoming damage by 2 and stops critical hits. When you're hit by a melee attack, the opponent gets the Reeling condition for three turns.
- Adamantine Shield - All attacks are granted reeling for 2 turns. You gain +2 AC, the Shield Bash reaction and you cannot be critically hit.