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Overview
The Underdark in Baldur's Gate 3 is only a small portion of the true Underdark. The Drow, Duergar and Deep Gnomes are native to the Underdark.
Locations
Adjacent regions
Regional Waypoints
The following Waypoints are available within the Underdark.
Underdark - Beach X: 22 Y: -209- Underdark - Selûnite Outpost X: 180 Y: -235
- Underdark - Myconid Colony X: 101 Y: -101
- Underdark - Sussur Tree X: 49 Y: -140
- Underdark - Grymforge X: -647 Y: 382
- Underdark - Ancient Forge X: -612 Y: 294
Access
Due to its immense size, there are multiple access points into the Underdark from over-land. All of them involve travelling (or falling) deep into the depths of the world.
The following locations contain known access points into the Underdark:
- Ladder from the Defiled Temple, arriving in the Selunite Outpost.
- Elevator from the Zhentarim Hideout, arriving in the Storehouse.
- Mushroom Circle in the Overgrown Tunnel to a corresponding circle in Torchstalk Gulch
- Falling into the hole in the Whispering Depths, arriving in the Minotaur Hills.
or the ability to 
must be used or a cutscene will show the party falling to death.
Areas
Storehouse
The Storehouse is in the most north-eastern quadrant of the Underdark map. This area is recognisable for its aging pale wooden interior and is free of any enemies.
Enter the Underdark through this area when departing from the over-world's Zhentarim Basement.
Minotaur Hills
Considered part of the Storehouse, this unnamed area of the Underdark is recognisable thanks to its bright green grass and whimsical red mushrooms with swirling paths featuring wandering Minotaurs. This area is directly to the south of the Storehouse via the rope netting.
Ebonlake Grotto
The Ebonlake Grotto is recognisable for its densely packed oversized mushrooms, and roaming Myconids amidst which reside several NPCs and merchants.
Myconid Minefield
Considered part of the Ebonlake Grotto and in its south-east part, this nameless area of the Underdark is recognisable for being full of dangerous mushrooms such as Timmask and Bibberbang, which are a particularly dangerous combination with Torchstalk mushrooms that can quickly turn the area into a series of explosions.
Giant Bird Nest
Considered part of the Ebonlake Grotto and to its south-west, this unnamed area is an unremarkable corridor connecting Ebonlake Grotto, the Dread Hollow and the Decrepit Village. It is most recognisable for the giant bird's nest.
Dread Hollow
The Dread Hollow is in the north-west of the Underdark. This area is recognisable for the large and brightly shining 
Sussur Tree, as well as the roaming Hook Horrors and a hostile wizard, Filro the Forgotten, living along its branched roots. A Bulette can also be spotted in the area.
To the south lies the tombstone of Myrna, a pet dog of Lenore.
Bibberbang Grotto
North-east of the Sussur Tree in the Dread Hollow section of the Underdark, the Bibberbang Grotto is an unnamed area of explosive and densely growing Bibberbang mushrooms, trapping Baelen Bonecloak.
Arcane Tower
The Arcane Tower is in the south-west corner of the Underdark map. This area is recognizable by its neatly built stone entryway that opens to a front garden featuring Arcane Cannons.
Torchstalk Gulch
Considered to be part of the Arcane Tower and to its east, this unnamed area of the Underdark is recognisable by its dark brown paths paved with deep red mushroom clusters and spots of Torchstalk that cast floating embers into the air. The corpse of a Dead Drow can be found, having been killed by an unexpected fall. It can be spoken to with 
.
Also, a few mushroom circles can be found here, one of which X: 98 Y: -283 leads to the Sunlit Wetlands X: -74 Y: 210.
Festering Cove
The Festering Cove is a partially hidden location containing some Kuo-toa worshipping their god BOOOAL. It can be reached by climbing down the cragged rock in Torchstalk Gulch X: 80 Y: -241.
Selûnite Outpost
The Selûnite Outpost is in the south-east corner of the Underdark map. This area is recognisable by its crumbling stone walls, grated windows, and tattered blue banners to the goddess Selûne. A statue of the goddess holds up a bright moonstone, which channels energy into the front gate's defences.
The Outpost can be reached from the Shattered Sanctum.
Ancient Battlefield
Directly north of the Selûnite Outpost, this unnamed area of the Underdark is recognisable by its field of scattered wooden barricades and long-dead skeletons of ancient fighters.
Petrified Battlefield
To the west of the Selûnite Outpost, this nameless area of the Underdark is recognisable by its purple Glowing Gems and several petrified Drow as well as one Spectator.
Decrepit Village
The Decrepit Village is the central area of the Underdark and fairly vertical. It is recognisable for its ramshackle wooden structures and rope netting enclosures. The lowest level of the Decrepit Village features a sandy beach strewn with the bodies of dead Deep Gnomes and Duergar. A boat rests at one dock, ready to take the party to Grymforge based on the story path of their choosing.
Grymforge
Grymforge is an expansive and abandoned settlement on a separate map, containing the Adamantine Forge. It is accessible via the boat at the Decrepit Village.
Characters
Notable NPCs
Arcane Tower:
Decrepit Village:
Dread Hollow:
Ebonlake Grotto:
Festering Cove:
Petrified Battlefield:
Available to Speak with Dead
- Dead Drow - found in the Torchstalk Gulch area
Creatures
Notable loot
Quest Items
Other notable
The following loot may all be obtained in the unnamed areas of the Underdark region (additional loot is available in named locations within the Underdark) whether looted, purchased, or obtained as a quest reward: [Needs Verification]
Bloodguzzler Garb
Dog Collar - by digging up the grave in Dread Hollow South
Drow Studded Leather Armour
Explorer's Ring
Icy Crystal
Helmet of Autonomy
Phalar Aluve X: 117 Y: -192: by passing a Strength or Religion check to free this sword from a stone
The Spectator Eyes
Hidden treasure
- Buried Chest X: 138 Y: -120: Pass the check to dig up chest near the Storehouse
- Buried Chest X: 123 Y: -234: Pass the check to dig up this chest near the Petrified Battlefield
- Giant Nest X: 49 Y: -153: Climb the mushrooms to reach the chest contained in this Giant Bird Nest
- Buried Wooden Chest X: -41 Y: -205 Pass the check to dig up this chest
- Buried Wooden Chest X: -74 Y: -275 Pass the check to dig up this chest in the Garden just outside the door of the ground floor Arcane Tower.
- Buried Wooden Chest X: 11 Y: -296 Pass the check to dig up this chest near the arcane tower
- Buried Wooden Chest X: -2 Y: -238 Pass the check to dig up this chest on beach near Decrepit Village below Arcane Tower
- Buried Wooden Chest X: -9 Y: -65: Pass the check to dig up this chest near the center of the Bibberbang Grotto in Dread Hollow
- Buried Wooden Chest X: -408 Y: 310 Pass the check to dig up this chest at The Festering Cove
- Buried Wooden Chest X: -413 Y: 241 Pass the check to dig up this chest at The Festering Cove
Related quests
The following quests may all be found in unnamed areas of the Underdark region (additional quests are available in named locations within the Underdark):
External Links
Underdark on the Forgotten Realms Wiki
Underdark on Wikipedia