Grymforge is a visually and narratively intriguing area of Baldur's Gate 3. Within it lies the Adamantine Forge, dormant when you find it, that can be used to craft your character some excellent equipment. However, you won't be able to do anything with it until you get the Adamantine Forge up and running.
This is a lengthy process and will culminate in a pretty severe boss fight. However, when you know what you are doing, including how to locate the forge in the first place, the entire experience will be easy work.
Where To Find The Adamantine Forge
You can find the forge within the Grymforge area of the Underdark. You will come to this area during the game's main story progress as you make your way to the Shadowlands. You can also acquire a side quest for the Sovereign that will finish in this area. You can get to this area by using the Duergar boat that is on the shore near the Underdark Beach Waypoint.
The boat will take you to Grymforge, where you can start by going up the stairs and taking your first right. Pass by the Deep Rothe here and take a left at the end of the path. You will come across another group of Deep Rothe being used by Duregar to clear some rubble from the path.
There are a couple of ways you can handle getting this rubble out of the way:
- Kill the Duregar and clear the rubble yourself.
- Using Animal Handling or Speak with Animals to get the Deep Rothe to help you clear the rubble, also triggering a confrontation with the Duregar.
Whichever option you choose, travel along the new path, being careful to avoid or disarm all the traps that are lining the path. Eventually, you will see a ladder leading down alongside the left of the path. Head down the ladder, and you will come to a suspended platform with some levers on it.
How To Solve The Suspended Platform Puzzle
This puzzle will require your party to split up, with one member staying at the levers (Lever Character), another to jump across the catwalks (Catwalk Character), and another to stand on the platform (Platform Character). Follow the steps below in order to solve the puzzle quickly:
- Lever Character uses the levers to move the platform to the other side of the catwalk
- Platform Character then needs to get off the platform and move to the right side, on the opposite end, and find another group of levers.
- Catwalk Character needs to be on the end suspended above the Central Chamber.
- Beneath the Catwalk Character is another platform that they need to jump down to.
- The Platform Character interacts with the new batch of levers to move the new platform to the other side.
- Catwalk Character needs to jump off and discover the Ancient Forge Waypoint.
Now, just Fast Travel the rest of the party to this Waypoint, and there you go: the party is all together, and you have discovered the Adamantine Forge.
How To Use The Adamantine Forge
In order to use the Adamantine Forge, you will have to get your hands on one of the six types of Moulds that are in the area, as well as some Mithril Ore. Once you have both of these materials, place the Mould in the Mould Chamber of the Forge, and the Mithral Ore in the Crucible.
Now, pull the Forge Lever to lower the platform down to the Lava Flow Control. Here, you can activate the Lava Flow Control to start pouring lava into the Forge while also triggering the appearance of a big bad named Grym. This guy has a massive 300 Hit Points and is no pushover.
How To Defeat Grym
The trick to taking this guy down is to keep him superheated at all times. This is done by using the Lava Flow Control to send the lava flowing through the area. If the lava is not flowing and Grym is not overheated, he won't take any damage.
This means that you need a magical or ranged-based character to be placed in a spot where they can easily manipulate the valve. Their role will be to constantly be turning the valve so that the lava never stops flowing.
The other characters will be aiming to not only do damage with their own attacks, but also to lure Grym into the center of the area, underneath the Forge Hammer. Grym will go after whichever character attacks him last, so use this to get him to the correct spot.
Once he is there, another character needs to pull the Forge Lever to drop the Forge Hammer, which will deal a ton of damage. If you play your cards right, you can even use the Forge Hammer multiple times in a turn to deal massive damage to Grym.
Just keep the attacks coming — especially with the Forge Hammer — and Grym will fall.