Baldur's Gate 3 How to defeat Grym and use the Forge
Screenshot: Larian Studios

Baldur’s Gate 3 (BG3): How to defeat Grym and use the Forge

How do I use the Forge in Baldur's Gate and how do I defeat Grym easily?

Upon reaching the Adamantine Forge in Baldur’s Gate 3, it can be confusing figuring out how it works. And, once you get the Forge to work, you immediately need to fight Grym, who is a really hard boss. There are certain strategies to this fight many players don’t even know about. Here is how to use the Forge and defeat Grym in Baldur’s Gate 3.

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How to use the Forge in Baldur’s Gate 3

Baldur's Gate 3 How to defeat Grym and use the Forge

Screenshot: Larian Studios

After traversing through the Grymforge and Ancient Forge regions in Baldur’s Gate 3, you’ll finally find the Adamantine Forge, which allows you to create some of the best weapons and armor in the game. As you explore the areas before the Adamantine Forge, look for Moulds and Mithral, like this Splint Mould, as they will be found here and there.

I found Mithral directly north of the Adamantine Forge after cracking open the large blue stone. You’ll be ambushed by a bunch of Magma Mephits, so watch out for that. They are pretty easy to take out. You can find Moulds on the ground scattered about. You’ll find all of them as you make your way to the Adamantine Forge.

Once you’re at the Adamantine Forge, insert any Mould you have into the Mould Chamber, then your Mithral in the Crucible in the middle. Pull the Forge Lever on the south side, and the entire platform will descend to the lower level. Next, go over to the east side and spin the Lava Valve. Now that you know how to use the Forge in Baldur’s Gate 3, let’s move on to how to defeat Grym.

Note: Before you spin the Lava Valve make sure to Short Rest and ungroup your party. Have each member on a different circle, with one near the lever that pulls the Crucible hammer, and one on the Crucible itself.

How to defeat Grym in Baldur’s Gate 3

Baldur's Gate 3 How to defeat Grym and use the Forge lava

Screenshot: Larian Studios

This technique is a bit of cheese to defeat Grym, but it’s actually the only way to defeat Grym because this is a gimmick boss battle. You can use spells and arrows to defeat Grym, but it has 300 health and will eliminate your party in just a few hits.

The best strategy I used to defeat Grym was to lure it to the middle and pull the lever to slam the Crucible hammer onto it. This will down any party member at the Crucible if they are still there, so if you can, disengage and get off the platform.

Related: How to read the Necromancy of Thay in Baldur’s Gate 3

Grym puts a status called Prime Target on whoever hit it last, so have the character on the Crucible hit Grym to lure it to the middle. I used Wyll’s Eldritch Blast because, at level 5, he can fire two Eldritch Blast attacks, which helps to not miss. Make sure to stand on the edge of the Crucible so Grym is more centered under the Crucible hammer.

After luring Grym to the center and taking a hit, I used disengage to avoid the Opportunity Attack and jumped onto the Moulding Chamber. I then had my party member pull the Forge Lever to bring down the Crucible hammer. It leaves Grym at 180 health, and four Magma Mephits spawn on the west side of the stage.

While Grym is knocked prone, take out the Magma Mephits. To deal more damage to Grym, you need to turn the lava on and pull the Forge Lever again. Grym won’t be damaged if you swing the Crucible hammer without lava on the field. It’s extremely important to notice that Grym is resistant to practically every single damage type.

Since Grym is resistant to basically everything, the only way to defeat him is with the Crucible hammer and lava. Once you hit Grym with the Crucible hammer with lava on the field, he’ll gain the status Superheated. This makes Grym super vulnerable to Bludgeoning damage, which worked perfectly with my Monk’s unarmed and staff attacks. He takes half Slashing, Piercing, Acid, Thunder, Cold, and Psychic damage, too, but I recommend using Bludgeoning damage to end the fight quickly.

Baldur's Gate 3 How to defeat Grym and use the Forge crucible hammer

Screenshot: Larian Studios

After hitting Grym for a few turns, I lured it into the middle again and, with lava around, pulled the Crucible hammer and killed it even with 150 HP left. Two of my allies went down in the process, but I turned on Turn-Based Mode now that the fight was over and rushed over to help them up.

And just like that, you’ve defeated Grym! Now, you can snag your new forged gear and forge even more equipment. You can also start looking for Infernal Iron to continue romancing Karlach.


Baldur’s Gate 3 is available on Steam and the PlayStation 5.


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Noah Nelson
From his early days of blog-style music, movie, and game reviews to working as the Esports Writer at Coastline Community College, Noah Nelson now works fulltime as a Staff Writer for Attack of the Fanboy and PC Invasion. He has been helping gamers everywhere with Destiny 2 god rolls, Warzone 2 DMZ missions, and collectibles in any indie game for over a year and a half. His Bachelor's Degree in English Rhetoric and Composition with a minor in Journalism from CSULB has shaped him to be a strong writer and editor. His fondest gaming memory is playing Sly Cooper 2 after begging his mom (for hours) to play it before his birthday and he still cries myself to sleep remembering the time he accidentally saved over his 99% completion save file in Kingdom Hearts 2.
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Anyka Pettigrew
Anyka Pettigrew has been a Staff Writer for PC Invasion since November 2023 and a Contributing Writer since February 2023. She is a Canadian graduate of a Bachelor of Arts degree who has been writing in games journalism for four years. Anyka is an avid guides writer but also enjoys writing anything from news pieces, to reviews, and even opinion pieces. Having a never-ending passion for video games for as long as she can remember got her into a plethora of genres like action adventure, RPGs, horror, survival etc. Some of her favorite franchises are God of War, Persona, The Last of Us, Zelda, and Resident Evil. She also enjoys reading fantasy and sci-fi books, as well as drawing digital art. Anyka also regularly listens to podcasts on gaming news from 'Kinda Funny Games', and 'Play, Watch, Listen'.