The Adamantine Forge is one of the most rewarding secret locations in Baldur's Gate 3, situated deep within Grymforge in the Underdark. Players can discover six unique item moulds throughout the environment, but the strict limitation of only two Mithral Ore deposits means you must carefully choose which gear to craft. Understanding the strengths of each available reward allows you to equip your party with high-tier equipment that lasts well into the later chapters.
The Powerful Defense of Adamantine Armor
Crafting either the Adamantine Splint Armour or the Adamantine Scale Mail provides unmatched defensive perks during Act 1 and Act 2. Both pieces grant complete immunity to incoming critical hits while inflicting the Reeling condition on attackers who land physical strikes. Furthermore, the flat damage reduction passive ensures your front-line combatants stay standing during grueling encounters.
Utility and Protection with the Adamantine Shield
The Adamantine Shield serves as an excellent defensive off-hand option for spellcasters and martial characters alike. Equipped characters gain critical hit immunity alongside the unique Shield Bash reaction, which can knock attacking foes prone. Additionally, missing an attack against the wielder causes the opponent to gain Reeling, severely impairing their combat effectiveness.
Specialized Weapons for Objects and Combat
The forge offers three distinct weapons: the Adamantine Longsword, Adamantine Scimitar, and Adamantine Mace. Every adamantine weapon features the Lethal Weapon trait to bypass certain resistances, as well as the Diamondsbane trait, which guarantees critical hits against objects. While these weapons provide solid performance, many players find that defensive gear retains value far longer into Act 2.
Making the Best Choice for Your Party Setup
Because Mithral Ore is strictly capped at two pieces per playthrough, picking the right combination depends on your party composition. Combining a heavy or medium armor piece with the shield often provides the greatest overall benefit across most combat encounters. Evaluating your team's armor proficiencies beforehand guarantees that neither of your precious forge rewards goes to waste.