Defeat the Duergar

Key takeaways

The quest is an Underdark mission with a clear combat objective and several useful follow-up rewards.

Start with Sovereign Spaw Speak with Sovereign Spaw at the Myconid Colony in Ebonlake Grotto to begin the quest.
Fight at the Underdark Beach The required combat objective is to travel to the Underdark Beach and kill the Duergar group occupying the area.
Use the terrain High ground is a useful tactical option during the beach battle and can provide a meaningful advantage.
Return to the colony After the Duergar are defeated, revisit Sovereign Spaw to access the treasure room and receive the available follow-up opportunity.
Watch for connected content The Great Furnace of Grymforge can initiate the quest for the Adamantine Forge, and Sovereign Spaw can offer a task concerning True Soul Nere.

Defeat the Duergar is an Act 1 Underdark quest that begins with Sovereign Spaw at the Myconid Colony and leads to a confrontation at the Underdark Beach.

Sovereign Spaw can initiate this quest at the Myconid Colony in Ebonlake Grotto. Spaw asks the party to travel to the Underdark Beach and remove the group of Duergar occupying the area. The assignment is focused on the immediate threat posed by the hostile Duergar rather than on resolving every problem associated with the faction in the Underdark.

The central objective is straightforward, but the beach encounter rewards careful positioning. Strategic players can use the available high ground to gain a combat advantage, making the approach and opening turns especially important. A Myconid named Glut can also be recruited to assist in the fight, although Glut has a separate agenda involving the colony and should not be treated as a consequence-free companion.

Once the Duergar have been defeated, the party gains access to the treasure room within Sovereign's Refuge. The quest also opens a path into further Underdark developments: Sovereign Spaw offers a follow-up task involving the head of True Soul Nere, while the book The Great Furnace of Grymforge starts the quest connected with the Adamantine Forge. These rewards and follow-up opportunities are the main reasons to return to Spaw after the battle.

Where this sits

StartSpeak with Sovereign Spaw

TravelReach the Underdark Beach

ConfrontationDefeat the Duergar

AftermathReturn to Sovereign's Refuge

1Sovereign Spawquest-giverThe quest begins at the Myconid Colony.
●Underdark BeachobjectiveThe Duergar occupy this area and are the mission's primary target.
3Sovereign's Refugereward-locationCompletion grants access to its treasure room.

This quest forms a short route from the Myconid Colony to the Underdark Beach, followed by a return to Sovereign Spaw.

Requirements

The supplied source establishes one starting requirement: the party must speak with Sovereign Spaw at the Myconid Colony in Ebonlake Grotto.

RequiredReach the Myconid ColonyThe quest is initiated at the Myconid Colony, which is located in Ebonlake Grotto in the Underdark.
RequiredSpeak with Sovereign SpawSovereign Spaw is the character who assigns the objective involving the Duergar at the Underdark Beach.
RequiredPrepare for combatThe mission requires the party to kill the Duergar group occupying the beach. The sources do not establish a required level, class, equipment set, or party composition.
OptionalConsider Glut's assistanceThe Myconid named Glut can be recruited to assist in the fight, but his own agenda involving the colony makes this an informed optional choice rather than a documented requirement.

Objectives

Speak with Sovereign Spaw at the Myconid Colony.This conversation initiates the quest and provides the assignment.
Travel to the Underdark Beach.The beach is the location occupied by the Duergar group targeted by the mission.
Kill the Duergar occupying the Underdark Beach.The primary objective is completed by defeating the hostile Duergar at the beach.
Return to the Myconid Colony after the battle.Returning to Sovereign Spaw leads to the quest's reward access and the available follow-up concerning True Soul Nere.
Read The Great Furnace of Grymforge.The supplied source identifies this book as the item that initiates the quest for the Adamantine Forge.Optional

Walkthrough

01
Reach the quest giver
Find the Myconid Colony
Travel to the Myconid Colony in Ebonlake Grotto, within the Underdark. The quest does not begin at the beach itself; the initial conversation with Sovereign Spaw is the step that establishes the assignment.
Location: Myconid Colony, Ebonlake Grotto
02
Initiate Defeat the Duergar
Speak with Sovereign Spaw
Talk to Sovereign Spaw and accept the request concerning the Duergar intruders. If the conversation is skipped or the party leaves without taking the assignment, the supplied sources do not establish whether the objective can later be recorded under this exact quest entry.
Location: Myconid Colony
Watch outDo not assume that fighting unrelated Duergar automatically starts this specific quest; the documented starting point is Sovereign Spaw.
03
Prepare for the confrontation
Decide whether to recruit Glut
Before the beach confrontation, consider whether to recruit the Myconid named Glut as an assistant. Glut can help in the fight, but he has his own agenda involving the colony, so bringing him along may connect the combat to additional colony developments.
Location: Myconid Colony and route to the Underdark Beach
TipTreat Glut as an optional strategic and narrative choice rather than a mandatory party member.
04
Reach the Duergar-held area
Travel to the Underdark Beach
Make your way from the colony to the Underdark Beach, where the Duergar are occupying the area. The supplied material does not specify a single required entrance, route, or traversal sequence, so use the map and your available exploration path rather than waiting for a prescribed doorway.
Location: Underdark Beach
05
Set up for combat
Take a favorable position
Before committing to the fight, inspect the beach and look for high ground. The sources specifically identify high ground as a way to gain a significant combat advantage, making it preferable to begin the encounter from a position that improves your control of the battlefield.
Location: Underdark Beach
TipAvoid rushing into the open area when a higher position is available.
06
Kill the Duergar
Defeat the Duergar
Kill the group of Duergar occupying the Underdark Beach. The supplied sources do not provide a confirmed enemy count, named combat phases, attack list, or numerical statistics, so focus on eliminating the hostile group while preserving enough resources for the return journey and any connected conversations.
Location: Underdark Beach
Watch outThe mission's combat objective is not complete until the occupying Duergar group has been defeated.
07
Report success
Return to Sovereign Spaw
After the beach is clear, return to the Myconid Colony and speak with Sovereign Spaw again. This follow-up conversation is important because completion grants access to the treasure room within Sovereign's Refuge and can lead to the next task involving True Soul Nere.
Location: Myconid Colony
08
Collect the quest rewards
Claim the unlocked rewards
Use the access granted by completion to reach the treasure room within Sovereign's Refuge. The supplied source associates the quest with rewards including Shadow of Menzoberranzan and Bliss Spores, but it does not establish a complete item-by-item route through the room.
Location: Sovereign's Refuge
09
Continue related Underdark content
Check the follow-up content
After completing the assignment, review the new opportunity offered by Sovereign Spaw to deliver the head of True Soul Nere. Also look for The Great Furnace of Grymforge, a book identified as the item that initiates the quest for the Adamantine Forge.
Location: Sovereign's Refuge and the Myconid Colony

Mission mechanics

The quest is built around a single hostile-area objective rather than a chain of separately documented combat encounters. The party receives the assignment from Sovereign Spaw, travels to the Underdark Beach, and clears the Duergar presence there. Duergar encountered elsewhere may be connected to other activities, including side quests involving stolen boots, but the source specifically frames the Duergar at the beach as the targets for this mission.

Positioning is the clearest documented tactical consideration. High ground can provide a significant advantage during the beach battle, so scouting before entering combat is more reliable than treating the encounter as a flat arena. The supplied material does not confirm enemy numbers, individual Duergar abilities, environmental hazards, or a fixed initiative order, and those details should not be assumed.

Glut provides an additional layer of choice. The Myconid can be recruited to assist in the fight, but the source warns that he has his own agenda involving the colony. This means the optional helper is relevant both to combat preparation and to the wider consequences of how the party handles Myconid Colony content.

What works and what does not

Strengths

The objective is clearly defined once Sovereign Spaw assigns it: travel to the Underdark Beach and eliminate the occupying Duergar.
High ground offers a documented tactical advantage in the beach battle.
Completion opens the treasure room within Sovereign's Refuge and connects to further Underdark content.
Glut can be recruited to add optional assistance to the encounter.

Weaknesses

The mission can be confused with other Duergar-related activities, including side quests involving stolen boots.
Glut's assistance is not consequence-free because he has his own agenda involving the colony.
The supplied sources do not establish a complete enemy roster, combat count, or detailed encounter script, so a fully prescriptive combat plan cannot be verified.

Best uses

Approach the beach as a terrain-based combat encounter rather than charging directly into the occupied area.
Return to Sovereign Spaw after the battle instead of treating the kill objective as the end of the quest.
Use the quest as a gateway to the treasure room and the connected True Soul Nere and Adamantine Forge content.

Completion checklist

Speak with Sovereign Spaw at the Myconid Colony.This is the documented way to initiate the quest.
Travel to the Underdark Beach.The beach is the mission's target area.
Survey the area for high ground before engaging.High ground is identified as a useful combat advantage.
Defeat the Duergar occupying the beach.This completes the primary combat objective.
Return to Sovereign Spaw.The return unlocks the quest's aftermath and rewards.
Enter the treasure room within Sovereign's Refuge.Access is granted after the Duergar are defeated.
Check for the follow-up involving True Soul Nere.Sovereign Spaw offers this after the task succeeds.Optional
Locate The Great Furnace of Grymforge.The book initiates the quest for the Adamantine Forge.Optional
Decide whether Glut should assist.The Myconid can help, but has a separate agenda.Optional

Items and connected findsSpoilers

01
Shadow of Menzoberranzan
Where: Treasure room within Sovereign's Refuge
Listed among the rewards associated with completing the quest.
02
Bliss Spores
Where: Treasure room within Sovereign's Refuge
Listed among the rewards associated with completing the quest.
03
The Great Furnace of Grymforge
Where: Associated with the quest's aftermath and Underdark progression
Reading or obtaining this book initiates the quest for the Adamantine Forge.

Failure conditions

The Duergar group remains aliveThe primary objective is to kill the Duergar occupying the Underdark Beach; leaving members of the occupying group undefeated does not satisfy the documented objective.
The party attacks the wrong Duergar-related targetSome Duergar offer side quests, such as finding stolen boots. Those activities should not be confused with the hostile group assigned by Sovereign Spaw for this mission.
The party ignores the return to Sovereign SpawThe beach battle is only one part of the quest's progression. Failing to return to the Myconid Colony means missing the documented access to the treasure room and the follow-up conversation.
Glut's agenda is overlookedRecruiting Glut can assist in the fight, but the source states that he has his own agenda involving the colony. The consequences of that agenda are not fully established in the supplied material.

On failure

The supplied sources do not document exact save points, automatic checkpoints, or a formal game-over condition for this quest.

Rewards and dropsSpoilers

Access to the treasure room within Sovereign's Refuge
Completing the task grants access to the treasure room.
Shadow of Menzoberranzan
Identified as one of the items included among the quest rewards.
Bliss Spores
Identified as one of the items included among the quest rewards.
The Great Furnace of Grymforge
The book initiates the quest for the Adamantine Forge.
Follow-up involving True Soul Nere
Sovereign Spaw offers a subsequent quest to deliver the head of True Soul Nere after the Duergar task succeeds.

AftermathSpoilers

The quest opens more Underdark progression

After the Duergar are defeated, return to Sovereign Spaw. Completion grants access to the treasure room within Sovereign's Refuge, and Spaw offers a follow-up quest involving the head of True Soul Nere. The Great Furnace of Grymforge also provides a route into the Adamantine Forge quest.

Trivia

The quest is associated with the Underdark's Myconid Colony and its sovereign, Sovereign Spaw.
The beach encounter is specifically noted as one where high ground can provide a significant combat advantage.
The Great Furnace of Grymforge is both a listed quest-related item and the starting point for the Adamantine Forge quest.
The Duergar are involved in other activities in the Underdark, so not every Duergar interaction belongs to this mission.

Sources

Defeat the Duergar quest reference — bg3.wiki

Research note

This page is based primarily on the supplied source pack. Any game-specific detail not directly established there has been omitted; the content remains model-derived and unverified pending editorial review.

Relationships

Characters

Sovereign SpawQuest giverInitiates Defeat the Duergar at the Myconid Colony and offers a follow-up after completion.
GlutOptional assistanceCan be recruited to assist in the fight but has his own agenda involving the colony.

Locations

Myconid ColonyStarting locationThe quest begins here in Ebonlake Grotto.
Underdark BeachObjective locationThe Duergar occupying this area are the mission's primary targets.
Sovereign's RefugeTreasure roomCompletion grants access to the treasure room within this location.

Quests

True Soul NereFollow-up questSovereign Spaw offers a follow-up involving the head of True Soul Nere.
The Adamantine ForgeConnected questThe Great Furnace of Grymforge initiates the quest for the Adamantine Forge.