Adamantine Longsword is a Rare Melee Weapon found in Baldur's Gate 3.
Where To Find The Adamantine Longsword In Baldur's Gate 3
The Adamantine Longsword is one of several items that can be forged at the Adamantine Forge, located in the Underdark, and is tied to the quest "The Adamantine Forge". To obtain the
Adamantine Longsword from the forge, you will first need to gather the Longsword Mould,
Mithral Ore and defeat Grym. Once all of these conditions have been met, you can then forge the
Adamantine Longsword and equip it for use.
The Adamantine Forge Location
Below is the location where you can forge the Adamantine Shield (Grymforge region).