How To Defeat The Duergar Intruders In Baldur’s Gate 3

Defeat the Duergar Intruders quest in Baldur's Gate 3 will need you to take out the Duergar in the Underdark world on the request of Sovereign Spaw and end their reign of terror once and for all.

During our first visit to the Underdark in Baldur’s Gate 3, you will take on the Defeat the Duergar Intruders quest. This quest aims to eliminate the intruders who have been terrorizing the Underdark for some time.  

Once you enter the Myconid Colony, the narrator will ask you to speak with the leader of the Myconid colony, Sovereign Spaw. He will ask your help to eliminate the threat of Duergars. The journal will be updated with Defeat the Intruder quest when you accept his request. Our guide will help you complete the Defeat the Duergar Intruders quest in Baldur’s Gate 3.

Kill the Duergar by the lake in BG3

To kill the Duergars, head toward the Underdark Beach waypoint. You will encounter a Duergar named Gekh Coal. If you have talked to Sovereign Spaw already, he will meet you in a hostile manner. Otherwise, you can talk to him and get some more side quests from him.

However, in our case, there is no need to continue the conversation as the result will only lead to conflict. So, immediately attack Gekh Coal. He is not alone and will summon three more Duergars to help with the fight. 

Out of these four Duergars, three pose serious challenges. Despite having low numbers, this fight will be against you in no time if you don’t follow our instructions. 

  • Defeat Gekh Coal immediately, as he is a necromancer who can revive his dead comrades. 
  • There is an archer hiding inside the broken hut by using an invisibility spell. He shoots fire arrows that blast on impact. Make sure to have good fire protection and keep your party separated. 
  • There is another Invisible Enemy near the docks. Once you get an idea of his position, either use a spell with AoE damage or a bomb to make him appear. 

This will help you easily defeat the Duergars near the lake during the Defeat the Duergar Intruder quest in BG3.

Report back to Myconid Sovereign

Once you clear the threat of Duergar’s in the Underdark, loot the corpses and get back to Myconid Colony to talk with Sovereign Spaw in Baldur’s Gate 3. 

He will give you the title of “Peacebringer” and reveal a door from where you can get rewards for saving the Underdark by completing the Defeat the Duergar Intruders quest. Enter this area to obtain the following rewards. 

  • Scroll of Blindness 
  • Scroll of Ray of Sickness 
  • Flumph Mating Ritual (important item to start The Adamantine Forge side quest). 
  • Icy Metal. 

Should you side with Sovereign Glut or the Sovereign Spaw in Baldur’s Gate 3?

On your way to defeat the Duergar Intruders in BG3, you will meet Sovereign Glut. He, too, will ask your help to defeat the Duergars. When you get rid of them and on your way to report the Sovereign Spaw, you will meet him again. 

He will reveal that you should help him remove Sovereign Spaw, as he didn’t help him defeat the Duergars. Here, you can side either with the Sovereign Glut or Sovereign Spaw. Let’s look at the results of both:

Siding with Sovereign Glut

If you try to side with Sovereign Glut, Astarion will approve your decision, while all other companions will disapprove. When you report to Sovereign Spaw, he can read your mind and ask your intentions. There, you will start a fight and kill Sovereign Spaw. 

Remember, doing this will turn the Myconid Colony hostile towards you, and you will not reach the treasure door that the Spaw revealed. However, you will be handsomely rewarded by the Sovereign Glut. The main catch is that killing the Sovereign Spaw during the Defeat the Duergar Intruders quest in BG3 will unlock evil quests. You will not have many quests available in the future, and it is not a recommended course of action.

Siding with Sovereign Spaw

When you report to Sovereign Spaw, and he inquires about your intentions, you can reveal Sovereign Glut’s plans for him. This will result in your fight against the Sovereign Glut. But there will be no other consequence for that.

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Ali is a passionate RPG gamer. He believes that western RPGs still have a lot to learn from JRPGs. He is editor-in-chief at but that doesn't stop him from writing about his favorite video ...