Infernal Iron is used in one of your companion’s stories so Dammon can fix Karlach. In this guide on Where To Find Infernal Iron & Alloy In Baldur’s Gate 3 we list all of the locations we have discovered Infernal Iron, along with screenshots of the map so you can track them down easily and quickly.
Infernal Iron Location #1
Speak with the Blacksmith in the Glade once you have recruited Karlach as a Companion. He will then give you a quest to help her control her temperature. This will mark the first piece of Infernal Iron on your map.Infernal Iron Location #2
You can find one piece of Infernal Iron in the Zhentarim Basement, at the location shown above. The Zhentarim Basement can be located in Waukeen’s Rest, which is in the very North West corner of the map. There’s a small house guarded by a single NPC. The entrance to a secret hideout can be found inside that house.
Infernal Iron Location #3
You can find another piece of Infernal Iron in the Shattered Sanctum. You can reach the Shattered Sanctum from the Goblin Camp on the main map. You have to visit the camp as part of the story, then simply head into the Sanctum, defeat the boss at the end, and loot the giant chest.
Infernal Iron Location #4 (Alloy)
In the Underdark, at the Grymforge, speak with Stonemason Kith. He will have a series of Skill Checks you must pass as you analyze the rocks and debris around him. Complete all of the Skill Checks and he will give you an Infernal Alloy.
Infernal Metal Location #5
Defeat Yurgir, one of the bosses in the Gauntlet of Shar. You gain access to the Gauntlet of Shar via an entrance near the Mason’s Guild in X
Infernal Iron Location #6
Another piece of Infernal Iron, this piece can be located inside the vault room in the Gauntlet of Shar.
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