Are you looking for a walkthrough of the Underdark in BG3?
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Last update:31 May 2024
In thisBG3guide, you will find a complete walkthrough of Underdark.
You will discover all possible passages and secrets.
You will find out how to complete side quests and the location 100%.
How to get to Underdark?
There are 4 paths leading to Underdark.
The path you choose has no impact on the further story in Underdark.
One of the passages is located within the Goblin Camp.
You don’t have to solve themoon puzzleto unlock the door to Underdark.
Find the lever on the wallby passing a Perception skill check and unlock it using the Thievs' Tools.
After entering the Underdark, you will get to the Selunite Outpost.
You will find the next entrance in Whispering Depthsin the Blighted Village.
Not far from where you will fight the Phase Spider Matriarchisa chasm from which green light is emitted.
Bats will fly out of the chasm.
You must jump inside to get to Underdark.
Just remember tocast the Featherfall spellon all team members first.
After landing, you will get to the eastern part of Underground.
The next passage to the Underdark is in the Zhentarim’s hideouton the territory of Waukeen’s Rest.
You will find the entrance to the hideout in the small buildings near the barn with bulls.
After you get inside the hideout, we advise not to engage in a fight with the Zhentarims.
There is plenty of oil and flammable barrels all over building.
Therefore, fighting them can quickly result in the death of the entire team.
Find the sleeping wolf named Istor.
Next to him, you’ll find a door with an illusion spell imposed on it.
Go through the hidden doors.
Use the elevator and go down to Underdark.
You will find yourself in the north-eastern underground, not far from the Myconid Colony.
The last passage is in Auntie Ethel’s Teahousein the Sunlit Wetlands.
On the pageSave Mayrinawe have described the quest with the witch in details.
When you arrive at her house,extinguish the fire to get to her hideout.
Then interact with the door.
You will find out that the door is just an illusion.
Go through the door and reach the waterfall.
Jump to the other side.
Not far from the waterfall are the next doors covered with an illusion.
Behind them you will find agreen portal leading to the southern part of Underdark.
What to pay attention to in Underdark?
You will encounter many tough enemies and minibosses there.
The underground is also full of various traps.
Equip yourselves with tools to disarm traps, and remember to move carefully.
When your character approaches the trap, they will automatically perform a Perception check.
Some traps can be shot down with a regular arrow or a fire ball.
How to advance to Act 2?
From there you will be able to use the elevator, which will take you to the Moonrise Towers.
Go to the place marked on the map.
Upon approaching the cave with green mushrooms, a conversation with Baelen will begin.
Return to Derryth andcollect the reward, the Gloves of Uninhibited Kushigo.
Help Omeluum investigate the Parasite
In the Myconid Colony, there is a trader named Blurg.
During the conversation with him, tell him about your problem with the tadpole.
The merchant will summon the Mind Flyer - Omeluum.
When talking to Omeluum, tell him that you want to get rid of the tadpole.
Unlock the quest: Help Omeluum investigate the Parasite.
When you return to him with the acquired ingredients, Omeluum will create a potion for you.
After drinking, you will be able to pass several ability checks to unlock new Illithid powers.
Removing of the tadpole will fail, and the task will be completed.
This ring will be very useful in the fight against Nere in Grymforge.
Arcane Tower - how to destroy turrets and fire off the elevator?
The Arcane Tower is located in the southwestern part of Underdark.
To get inside and examine all its floors, you must first deactivate the turrets and activate the elevator.
The turrets will shoot anyone who tries to approach the door.
Cast the Fly or Featherfall spell on one of the characters and approach the turret near the statue.
Jump on the giant mushrooms at the back of the Tower.
Pick up the Sussure Flowers and use the lockpick to initiate the back door to the Tower.
Approach the generator and put a flower into it.
The elevator in the Tower will be unlocked.
Go up the stairs to the elevator and go up 2 floors.
launch the main door of the Tower and let the rest of the team inside.
Arcane Tower - what can you find there?
On the 2nd floor, you will find an Gilded Chest on one of the balconies.
You will find a Dog Collar there.
On this floor, you will also find an Engraved Githyanki Disc on one of the bookshelves.
On the top floor you will encounter robots.
On the table by the robots, you will find aGuiding Light ring.
Put on the ring to discover a button in the elevator that leads to the basement.
Go down to the basement and search all the bookshelves.
Don’t forget to take theStaff of Arcane Blessing.
In the chest, you will find several scrolls, arrows, and theSparkswall ring.
As you approach the ships, a Duergar will accost you.
Take any ability check, then ask about the boots.
Propose help in finding the gnome.
You will find the gnome in the Mykonid colony, she will be lying on a large mushroom.
Talk to her and offer help in exchange for boots.
Cure the Poisoned Gnome
In the Mykonid colony, you will find the gnome named Thulla.
Give her the antidote to save her from dying.
If you don’t have an antidote with you, try visiting the nearest trader.
Antidote is a very common item in the game.
From Thull you will receive another quest -Save the Grymforge Gnomes.
Defeat the Duergar Intruders
In the Mykonid colony, on a large mushroom stands Sovereign Spaw.
You will receive a quest from him - Defeat the Duergar Intruders.
He will ask you to eliminate the Duergars from Underdark beach.
Go to the beach and attack the dwarves.
When the battle starts, more opponents will appear.
The strongest enemies will be on the 7th level.
Return to the mushroom colony and speak with the Sovereign Spaw.
Read the book and take the ability check to get to know the secret of the forge.
When you’re inside,shoot the stone on the statue which emanates light.
The statues at the gate will be deactivated.
Next, fire up the gate with a lockpick and let the rest of the team in.
In the remaining chests there will be some gold, Thieves' Tools, and tools for disarming traps.
Spectator
Spectator is a boss inBG3, which can be encountered in several ways.
It’s best, however, to confront him in Underdark, near the Selunite Outpost.
Here’s how to start a fight with the boss.
Not far from the outpost lies several petrified drows.
Attack one of them to awaken the Spectator.
Spectator has many powerful attacks and can perform several actions in his turn.
If your team is at least level 4, you should quickly deal with him using magical arrows.
The long sword Phalar Aluve is a finesse weapon dealing 5-14 damage 4 slashing damage.
Minotaurs
In Underdark, you could meet a few Minotaurs.
A fight with these beasts shouldn’t be too difficult if your team is at least level 4.
Minotaurs can make a long jump and attack several opponents at once.
Bulette
An earthquake?
No, it’s just another boss in BG3 - Bulette.
You may encounter this strange monster between the Whispering Tree and the beach in Underdark.
Bulette can suddenly jump out of the ground and instantly knock down several members of your team.
The monster has a sturdy armor and can easily dodge most attacks.
Use the strongest spells, such as Magic Missile and Poison Ray.
The defeated enemy will leave behind theBloodguzzler Garb, the perfect clothing for a barbarian.
A hidden path leads to the cove, not far from the place leading to Auntie Ethel’s hut.
A conversation with the inhabitants of the cove can be conducted in several ways.
And that’s it.
And fish, of course.
The only thing that might still interest you in the cove is a message in a bottle.
Do you remember the little Tiefling that could be saved from the harpies on the beach in Druid Grove?
Now you know what the boy was doing there.
Doni sent a letter to his father, stating that he hopes to see him in Baldur’s Gate.
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