According to multiple sources, the best Adamantine Forge items to make in Baldurs Gate 3 are:
- Adamantine Splint Armor
- Adamantine Scale Mail
- Adamantine Shield
- Adamantine Longsword
- Adamantine Scimitar
- Adamantine Mace
The Adamantine Splint Armor and Adamantine Scale Mail are considered the best items due to their high armor class, immunity to critical hits, and crowd-control effects. The Adamantine Shield is also a great option, offering a +2 bonus to armor class, the ability to send attackers reeling for two turns, and immunity to critical hits. The Adamantine Longsword and Adamantine Scimitar are useful weapons that deal slashing damage and apply the reeling debuff to attackers. The Adamantine Mace is the least useful item, as it is easily outclassed by other common magic weapons found in the game.