Baldur's Gate 3 Adamantine Forge Guide

The Adamantine Forge is an optional location in Baldur’s Gate 3 that you can find in the Underdark. By using this forge, you’re able to create powerful equipment for your party that’s exclusive to this location. We’ve made this guide to show you all the Adamantine Forge items in Baldur’s Gate 3.

Adamantine Forge Items in Baldur’s Gate 3

Here are the equipment you can make in the Adamantine Forge:

Equipment	Effect	Requirements
Adamantine Longsword	Versatile Hitter: Sends your targets Reeling for 1 turn if you’re holding it in one hand, 2 turns if you’re holding it in both Bonus Action: Pummel Strike Actions: Lacerate, Rush Attack	Longsword Mould, Mithral Ore
Adamantine Mace	Swift Hitter: Sends your targets Reeling for 1 turn Actions: Concussive Smash	Mace Mould, Mithral Ore
Adamantine Scimitar	Swift Hitter: Sends your targets Reeling for 1 turn Bonus Action: Flourish Actions: Lacerate	Scimitar Mould, Mithral Ore
Adamantine Splint Armour	Intense Adamantine Backlash: When melee attacks hit the wearer, enemies are sent Reeling for 3 turns. *Receiving terrible blows or hitting a strong metal will induce a -1 penalty to Attack Rolls for each remaining turns Reduces all incoming damage by 2 Attackers cannot land critical hits on the wearer	Splint Mould, Mithral Ore
Adamantine Shield	Adamantine Shield: When melee attacks miss the wielder, attacker gains Reeling for 2 turns	Shield Mould, Mithral Ore
Adamantine Scale Armour	Adamantine Backlash: When melee attacks hit the wearer, enemies are sent Reeling for 3 turns. *Disadvantage on Stealth Checks Reduces all incoming damage by 1 Attackers cannot land critical hits on the wearer	Scale Mail Mould, Mithral Ore

All of the items you can make from the Adamantine Forge requires Mithral Ore to smelt. This material can be found in the Underdark itself but they’re rather scarce. Another item you need is the moulds required for each weapon to be formed. These can be found around Grymforge just near the Ancient Forge itself.

You can get to the Adamantine Forge by going to the Underdark. There are several ways to get here, but the easiest is through solving the Defiled Temple puzzle in the Goblin Camp. Once you descend to the Underdark itself, look for the Beach waypoint which you can find southwest of the Myconid Colony. Here you’ll find a boat that takes you to the Adamantine Forge, Grymforge.

How Do You Activate the Adamantine Forge in BG3?

The Adamantine Forge can be activated by pulling the lever on the bottom left corner. This will allow you to put in the materials you need to forge equipment. The forge can be activated upon first beating the boss.

After the Grymforge boss is defeated, you can activate the Adamantine Forge as many times as you want. So long as you have the materials, you can make powerful equipment for your party.

How to Use the Adamantine Forge in Baldur’s Gate 3?

You use the Adamantine Forge by interacting with the environment. There is a big round piece where you insert the Mithral Ore and the coffin like structure where you insert the mould. After inserting the two, pull the lever located on the outer platforms before spinning the valve to release the lava and forging equipment.

It sounds like a complicated process at first but you’ll quickly get the hang of it. The Adamantine Forge can help you make powerful equipment with unique effects that can turn the tides into your favor. If you made a mistake in the process of making the equipment you want, there is a lever next to where you put the mould that you can pull. This will release out the mould you placed in so you can make a switch.

How to Beat the Adamantine Forge Boss in BG3?

The Adamantine Forge boss, Grym, will appear after you’ve first pulled the valve to release the lava. This boss is insanely difficult as Grym is resistant to many elemental attacks including cold, force, and lightning. The only time Grym is vulnerable to damage is when it’s standing on lava.

To beat the Adamantine Forge boss, have one of your characters stand on the top of the coffin like structure where you place the mould. Get Grym to target this character and have him move towards them. When the boss reaches the center of the machine, pull the lever. This will cause more than 100 damage to Grym and have him down by 2 turns.

When Grym is knocked down, now is your chance to strike and deal as much damage as you can. The Adamantine Forge boss isn’t the only thing you have to worry about beating as Mephit enemies will spawn after you do the above. They can quickly be dispatched with ranged weapons and spells.

Your reward for beating Grym is the Grymskull Helm which gives you the Hunter’s Mark spell. Creatures you use this spell on deal an additional 1-6 damage whenever you hit them with your weapon. Equipping this helm also prevents critical hits on the wearer and gives them resistance to fire damage.