Aid the Underduke is a side quest in Baldur's Gate 3 (BG3) involving the Guild Hall and the recruitable companion Minsc. See how to start this side quest, the objectives, rewards, as well as how to recruit Minsc in your party.

How to Start Aid the Underduke

Talk to Earspoon in Sharess' Caress

To initiate this Act 3 side quest, go to Sharess' Caress in Wyrm's Rock Fortress and talk to Earspoon near the lobby in the first floor.

You'll need to convince them to spill the beans about a certain Nine-Fingers and the location of the Guild Hall.

How to Get to Wyrm's Rock Fortress

Aid the Underduke Walkthrough

Aid the Underduke Summary
1	Go to the Guild Hall
2	Speak to Nine-Fingers
3	Gather Information On the Ambush
4	Obtain a Bank Pass
5	Open the Main Vault
6	Defeat the Cultists
7	Pursue the Stone Lord
8	Open the Sluice Gate
9	Defeat the Hostiles
10	Defend the Guild Hall

Go to the Guild Hall

Go to the Guild Hall which is located northeast of the Heapside Strand waypoint. You'll be stopped by a guard and you'll have to do some successful skill checks so he'll let you through.

Speak to Nine-Fingers

Once inside, head northwest, past the Guild Hall Bar, and into Nine-Fingers' Office. She will ask you to bring Jaheira and they'll talk about setting up an ambush on the Stone Lord.

If you don't have Jaheira recruited, you can go directly to the Counting House to face the Stone Lord, and continue the quest from there.

Jaheira Companion Guide: How to Unlock

Gather Information On the Ambush

Nine-Fingers will refuse to discuss further about the ambush, so head towards the Guild Hall entrance until you find a Halfling and a Gnome. Convince them to tell you about the details of the ambush.

They'll point you towards the Counting House, located at the southern area of the Lower City.

Obtain a Bank Pass

When you arrive at the Counting House, talk to Head Clerk Meadhoney behind the counter. You'll need to talk your way through so he'll grant you a temporary vault pass.

Open the iron fence in the middle of the Counting House and head down into the vaults.

Open the Main Vault

You'll eventually encounter a locked vault with a puzzle mechanism to open it. Step on the four tiles in the order shown above to unlock the vault.

Before you proceed into the passageway, get ready for a fight and prepare some See Invisibility spells if available.

Defeat the Cultists

After you enter the passageway, you'll meet the Stone Lord and some cultists who stole all the gold. The Stone Lord and the doppelganger of Jaheira will escape, leaving you to fight the cultists.

The cultists will turn invisible and hopefully your See Invisibility will reveal them. If not, you can use AoE spells to knock them out of it, as long as you have an idea of their general location.

Find the Stolen Gold

After the fight, you can talk to Rakath Glitterbeard and offer to find the stolen gold. The stolen gold is held by one of the Stone Lord's companions hiding out in the sewers, and you'll be heading there anyway. Rakath will reward you with an Elegant Studded Leather, a very rare light armor, if you return the gold.

You can also bargain with him to split the stolen gold if you find it. If you don't touch the gold and return it to him, he'll agree to split the gold, then give you the Elegant Studded Leather inside the vault.

Pursue the Stone Lord

After the fight, you'll need to chase after the Stone Lord into the sewers. Southwest of Bloomridge Park is a manhole which you can use to go down the sewers.

Proceed to the northwest until you find the Abandoned Cistern. Get ready for a fight as some guards will prevent you from going further in.

Open the Sluice Gate

After getting past the posted guards, you'll come upon a big contraption and some valves. Before anything else, have your characters interact with the Sluice Valve to the left of the Water Level Valve. If they pass the Athletics check, the Sluice Gate will open immediately, allowing you to skip this puzzle.

How to Open the Sluice Gate

To open the Sluice Gate, you'll need to match both water and temperature levels to perfect. This puzzle requires a bit of timing, so it's recommended to do this puzzle with a single character and avoid getting blocked by your allies.

1. Click the Water Level Valve and wait until it says Perfect Water Level.
2. Quickly click the Temperature Valve.
3. Go back to the Water Level Valve and click it again.
4. Wait for the Sluice Gate to open.

Head inside the tunnel and get ready for another fight.

Defeat the Hostiles

When you reach the end of the tunnel, you'll find Minsc, Jaheira's doppelganger, and some Zhentarim. You'll need fight your way through out of the chokepoint and move to a more favorable position.

Try to knock-out Minsc instead of outright killing him, or else you cannot recruit him as a companion and Jaheira will leave permanently. You can toggle non-lethal attacks in the Passives tab below the skills bar. If you have Jaheira recruited, you can spare Minsc from the Emperor and recruit him. Read the note from the corpse of Jaheira's doppelganger and return to the Guild Hall.

Retrieve the Stolen Gold from Roah

One of the enemies you'll encounter in the fight is the Zhentarim agent Roah. You'll need to kill her to get the stolen gold back. If Roah isn't among the enemies, the stolen gold could be with Boss Friol instead.

Defend the Guild Hall

When you arrive at the Guild Hall, the Zhentarim will be trying to take over the Guild Hall. Eliminate them and try to ensure that Nine-Fingers lives.

Speak to Nine-Fingers when the hostiles have been eliminated to finish the side quest, then she and the Guild will join you as allies in the final battle against the cult.

How to Recruit Minsc

Jaheira Needed to Recruit Minsc

To recruit Minsc, you'll need to have Jaheira recruited as well in Act 2. If you go through the side quest without Jaheira, you'll still be able to fight Minsc but he won't join you.

Jaheira Companion Guide

Knock Out Minsc with Non-Lethal Attacks

In the battle in the Abandoned Cistern, you need to take down Minsc with non-lethal attacks. You can switch to non-lethal attacks by selecting the Passives tab below the skills bar.

Spare and Follow Minsc After the Battle

After the battle, the Emperor will tell you to kill Minsc, but choose to save him instead. He will then go to a room in the northern side. Follow him through the hole in the wall and ask him to join you.

Aid the Underduke Rewards

Recruit Minsc as a Companion

Minsc is a Human Ranger and can be recruited in this side quest, as long as you don't kill him and have Jaheira recruited.

Companions Guide: All Recruitable Allies

Nine-Fingers and the Guild Become Allies

Nine-Fingers and the Guild will join you as allies in the final fight against the cult. They will be listed in the Act 3 quest Gather Your Allies.

Elegant Studded Leather

If you return Rakath Glitterbeard's gold, he will give you they key to vault number 9, containing an Elegant Studded Leather, a very rare light armor.

List of All Chest Armor

Baldur's Gate 3 Related Guides

List of All Side Quests

Prologue Side Quests

All Prologue Side Quests
How to Free the Intellect Devourer	How to Free Shadowheart

Act 1 Side Quests

Druid's Grove Quests

Druid Grove Quests
How to Steal the Sacred Idol	Should You Save The Goblin Sazza?	How to Avoid Tiefling Pickpockets
Save the Refugees	How to Save Nadira	How to Save Mirkon
How to Save the First Druid Halsin	How to Open the Stone Slab	Request Help from Nettie
How to Investigate and Expose Kagha	Save Arabella	-

The Risen Road Quests

The Risen Road Quests
Find the Missing Shipment	How to Rescue the Grand Duke
Rescue the Trapped Man	How to Free Oskar Fevras

Blighted Village Quests

Blighted Village Quests
How to Beat the Goblins: Blighted Village	How to Open the Necromancy of Thay	How to Recruit the Ogres
How to Finish the Masterwork Weapon	That Barn: Avoid Killing Buthir	Rescue the Gnome and Stop the Windmill

Goblin Camp Quests

Goblin Camp Quests
How to Get Volo's Ersatz Eye	Defiled Temple Puzzle
Find the Nightsong	Ask the Goblin Priestess for Help

Nautiloid Crash Region Quests

Nautiloid Crash Region Quests
Dank Crypt Guide	The Dying Mind Flayer	Auntie Ethel Quest Guide
How to Get Owlbear Cub	Spiderling Nest Guide-	How to Open the Selunite Chest
How to Get Scratch	Should You Heal Pandirna	Underground Passage Guide

Underdark Quests

Underdark Quests
Arcane Tower Guide	Defeat the Duergar Intruders	Save the Grymforge Gnomes
Find the Adamantine Forge	Deliver Nere's Head	How to Find the Mushroom Picker
How to Cure the Poisoned Gnome	Help the Cursed Monk	Omeluum Location

Mountain Pass Quests

Mountain Pass Quests
Steal a Githyanki Egg	How to Beat Gremishkas	How to Access Guardian of Faith Room
Dawnmaster Puzzle Guide	Where to Find the Githyanki Creche	-

This section is currently under construction. Check back later for updates!

Act 2 Side Quests

Last Light Inn Quests

Last Light Inn Quests
Seek Protection from the Shadow Curse	Rescue the Tieflings	Rescue Wulbren
How to Lift the Shadow Curse: Where to Find Thaniel	Find Zevlor	Help He Who Was
Investigate the Selûnite Resistance	-	-

Gauntlet of Shar Quests

Gauntlet of Shar Quests
Gauntlet of Shar: All Trials and Umbral Gems	Kill Raphael's Old Enemy

Mind Flayer Colony Quests

Mind Flayer Colony Quests
How to Solve the Necrotic Laboratory

Act 3 Side Quests

Rivington Quests

Rivington Quests
Investigate the Suspicious Toys	Solve the Open Hand Temple Murders	Find the Missing Letters
How to Get to Wyrm's Rock Fortress	How to Find Dribbles the Clown	-

Lower City Quests

Lower City Quests
How to Get to the House of Hope	How to Get to Cazador's Palace	Rescue Orin's Victim
Aid the Underduke	How to Get to the House of Grief	Investigate the Murders