Key takeaways
- The outpost is one of the Underdark’s four main entry points, reached by descending from the Defiled Temple beneath the Goblin Camp.
- Its moonstone-powered artillery is still active The safest solution is normally to destroy the Moonstone, although doing so removes the gate’s defensive weapon.
- The western ruins contain a scripted Spectator encounter and several petrified drow, including Dhourn, whose survival can advance The Adamantine Forge.
- Important fixed loot includes Luminous Armour, Helmet of Smiting, The Blast Pendant, Memory Shard, Icy Helve and The Spectator Eyes.
- The outpost itself has no resident trader, inn, quest-giver or ordinary civilian population. Its named “characters” are petrified drow and hostile or encounter-based creatures.
- Nearby, but technically outside the fortress, the party can claim Phalar Aluve and discover a hidden stash containing Drow Studded Leather Armour.
About this guide
Base game guide. Act One. Major spoilers for the Underdark, the Spectator encounter, Find the Nightsong and The Adamantine Forge.
Overview
The Selûnite Outpost is an abandoned fortified settlement in the south-eastern Underdark of Baldur’s Gate 3. It was established by followers of Selûne as an attempt to maintain a foothold below the surface, but the expedition failed. The surviving ruins still contain working magical defences, valuable equipment and evidence of the settlers’ increasingly desperate struggle against the Underdark’s inhabitants.
The outpost is small when compared with places such as Ebonlake Grotto or Grymforge, but its immediate surroundings are more extensive than the fortress itself. For this guide, Selûnite Outpost means the named outpost and the directly connected south-eastern area that includes:
The Storehouse, Arcane Tower, Ebonlake Grotto, Defiled Temple and the wider Minotaur Hills are neighbouring locations, not parts of the outpost. They are included only where they affect access, navigation or encounters.
Geography and boundaries
The Selûnite Outpost occupies a fortified position in the south-eastern Underdark. Its most recognisable feature is a stone gatehouse with a raised portcullis, ramparts and two defensive statues. Behind and around it are ruined walls, old barricades, abandoned weapons and the remains of long-dead defenders.
The named location is best understood as a fortress plus its immediately connected ruins, rather than as the whole south-eastern Underdark quadrant. The Storehouse lies to the north-east and is a separate location. The Defiled Temple is the surface-side route below the Goblin Camp. The Arcane Tower lies to the west, while the wider Underdark spreads towards Ebonlake Grotto, Dread Hollow and Grymforge.
Petrified Battlefield
The area west of the fortress is not given a separate proper location name in the game, but it is commonly treated as a subarea of the outpost. It contains:
The battlefield is reached through or around the ruined western part of the outpost. Entering openly can trigger the Spectator encounter.
Eilistraee’s sword site
On a high cliff nearby is an old ritual site dedicated to Eilistraee, the drow goddess associated with moonlight, freedom and redemption. The sword Phalar Aluve is embedded in stone there. This site is geographically close enough to be useful during an outpost sweep, but it is not part of the fortified building itself.
Hidden drow stash
Behind layers of spider webs on a nearby cliff is an old stash associated with Lolth-sworn drow. It contains Drow Studded Leather Armour and the book On Educating the Faithful. The stash is part of the same local exploration circuit, although it is outside the outpost walls.
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Access and routes
Entering from the Defiled Temple
The most direct route begins in the Goblin Camp.
This is one of the recognised overland entrances to the Underdark. Other entrances lead to different parts of the region, including the Storehouse, Minotaur Hills and the area near the Myconid Colony.
The route is effectively one-way at first. The outpost cannot normally be used to enter the Defiled Temple from the Underdark unless the relevant route has already been opened from the other side. It therefore cannot be used as a surprise infiltration route into the Goblin Camp.
Opening the outpost gate
The main exit is protected by the moonstone artillery. The gate’s magical system uses a large Moonstone held by a statue of Selûne. Energy is channelled to two smaller statues, which fire radiant blasts at creatures approaching or leaving the gate.
The artillery fires in the area between the portcullis and the nearest large rocks on the stone bridge. Its attack deals radiant damage in an area and allows a Dexterity saving throw to reduce the damage. The documented attack is 2d6 radiant damage, with a DC 12 Dexterity save for half damage.
Destroying the Moonstone grants the Acolyte inspiration event Shatter the Moon. It also disables the artillery, making the gate safer for future travel.
Navigation advice
Do not assume the fortress itself is the whole encounter zone. Several important rewards are outside the main walls.
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Entering from the Defiled Temple
- 01Enter the Defiled Temple beneath the Shattered Sanctum.
- 02Solve or bypass the moon-phase door puzzle.
- 03Descend the ladder into the Underdark.
- 04Arrive inside or immediately beside the Selûnite Outpost.
Navigation advice: The safest general route is
- 01Loot the interior before activating or leaving through the gate.
- 02Find the hidden room and take Luminous Armour.
- 03Search the locked chest for Helmet of Smiting.
- 04Deal with the moonstone before committing the party to the bridge.
- 05Exit and establish the waypoint.
- 06Sweep west towards the petrified drow.
- 07Visit the Phalar Aluve cliff and the drow stash before leaving the area.
The moonstone defence system
The outpost’s most memorable feature is its still-functioning Selûnite defence mechanism. The abandoned settlement is visibly decayed, but the weapon system remains active centuries or decades after its guardians disappeared.
The system is both a trap and a potential environmental weapon. A Minotaur from the nearby area can be drawn towards the entrance and struck by the radiant blasts. This can weaken the creature before a conventional fight, although relying on the artillery is not always safe if party members are standing in its targeting zone.
Recommended handling
The book In Search of the Nightsong, located near the Selûne statue, can progress Find the Nightsong. This is an investigation clue rather than a full quest resolution.
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Petrified Battlefield and the Spectator
The western ruins contain a group of drow who have been turned to stone. The source of the petrification is a Spectator, which reveals itself as the party approaches the battlefield.
The fight can begin when the party enters the area without stealth. The Spectator may use its Unpetrification Ray on the drow, restoring some of them during the battle. Restored drow can become confused or hostile depending on the circumstances and may be killed during the encounter.
Basilisk Oil
Basilisk Oil can restore petrified drow. Using it can also trigger the encounter sequence. This gives the party more control over when the battlefield becomes active, but it does not remove the underlying danger.
Dhourn and the Adamantine Forge
Dhourn is the most important of the petrified drow. If he survives, speaking with him can begin or advance The Adamantine Forge. If he dies, his corpse can still provide relevant equipment and progress.
The Memory Shard is particularly relevant to the search for the Adamantine Forge. Depending on how the conversation develops, Dhourn may also provide information connected with the drow expedition and the forge.
A drow player character, or a character disguised as a drow, receives additional dialogue options. The exchange can vary further for a female drow character. A particular humiliating outcome can grant the Noble inspiration event Know Your Place, while the circumstances of the encounter may determine whether Dhourn survives.
Named petrified drow directory
The following named drow are associated with the battlefield:
They are not a resident community or a functioning faction within the outpost. They are remnants of an expedition caught by the Spectator’s petrification.
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Loot and collectibles
The outpost is one of the better early Underdark locations for fixed equipment. It has no shop inventory, but several pieces of equipment are hidden behind locks, traps or encounter outcomes.
Main outpost loot
The hidden section containing Luminous Armour can be found with a DC 15 Perception check. If the party fails to detect the movable wall, the room can still be reached through the adjacent broken section by jumping through the breach. The chest is locked and trapped, so bring a character capable of handling both problems.
Battlefield and nearby encounter loot
The status of Dhourn affects how these items are obtained. Some may be looted from him if he dies, while a surviving Dhourn can produce additional dialogue before the party searches him.
Nearby exploration loot
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Main outpost loot
| Item | Location or source | Notes |
|---|---|---|
| Helmet of Smiting | Locked gilded chest in the outpost | Requires opening the chest |
| Luminous Armour | Locked, trapped chest behind a hidden wall section | The hidden door can be found with Perception |
| In Search of the Nightsong | Near the Selûne statue | Reading it advances Find the Nightsong |
| Moonstone | Held by the Selûne statue | Destroying it disables the artillery |
| Selûnite documents and diaries | Around the ruins | Provide background on the failed settlement |
Battlefield and nearby encounter loot
| Item | Source |
|---|---|
| Icy Helve | Dhourn |
| Memory Shard | Dhourn |
| The Blast Pendant | Dhourn |
| The Spectator Eyes | Spectator |
Nearby exploration loot
| Item | Location | Requirements or notes |
|---|---|---|
| Phalar Aluve | Sword embedded in stone on the Eilistraee cliff | Religion, Strength or blood-related solution |
| Drow Studded Leather Armour | Locked chest in hidden Lolth-sworn stash | Behind spider webs |
| On Educating the Faithful | Stone desk near the drow stash | Grants Sage inspiration when read |
Phalar Aluve and the Eilistraee ritual
The Phalar Aluve site is on a high cliff close to the outpost. The sword is set into a stone cradle surrounded by the remains of a ritual dedicated to Eilistraee.
The documented ritual path can grant the Acolyte inspiration event Last Rites of the Dark Dancer. A successful Religion check alone is not enough if the sword is then removed by a method that bypasses the blood rite. Paladins receive a different check profile, while a Cleric of Eilistraee can recognise the ritual automatically.
Practical advice
Phalar Aluve is particularly useful for characters who benefit from its support abilities, but the sword is not locked behind a single mandatory class choice. If you want the associated inspiration, follow the ritual rather than simply relying on brute force.
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There are several ways to claim it
- 01Pass the relevant Religion check to recognise the ritual.
- 02Shed blood as part of the rite.
- 03Use a Strength-based method to pull the sword free.
- 04Bypass the formal checks by placing blood on the stone.
The hidden Lolth-sworn drow stash
A cliffside stash is concealed behind several layers of spider webs. It is easy to overlook if the party focuses only on the fortress and the Spectator.
Reading the book can grant the Sage inspiration event Secrets of the Matron. The stash is useful both as a small equipment cache and as a contrast to the nearby Eilistraeean sword ritual. One site represents Lolth-sworn discipline and indoctrination; the other preserves a more hopeful drow religious tradition.
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Residents, factions and ordinary NPCs
Residents
There are no confirmed living civilian residents in the Selûnite Outpost. The settlement was abandoned, and the remaining inhabitants are represented by ruins, documents, corpses, petrified drow and hostile creatures.
Story-associated characters
These characters belong to the petrified drow encounter rather than to an active town population.
Selûnites
The original builders were followers of Selûne. Their banners, statue, documents and defensive architecture all point to an organised attempt to establish a Selûnite foothold in the Underdark.
The documents suggest that the expedition required increasing support and supplies from the surface. Conflict with drow and other local inhabitants eventually contributed to its collapse. The failure also appears to have damaged or hastened the decline of the Selûnite temple above.
Eilistraeeans
The nearby Phalar Aluve ritual site is associated with Eilistraee, not Selûne. The two goddesses are distinct, even though the site’s moonlit imagery and its location near a Selûnite fortress can make the local religious history seem unified.
Lolth-sworn drow
The hidden stash and the petrified expedition connect the area with competing drow traditions. The outpost’s records refer to hostility from drow, while the nearby stash preserves Lolth-sworn material.
Myconids
The wider territory around the outpost falls within the influence of the myconids of Ebonlake Grotto. This does not make the outpost a myconid settlement. On entering much of this part of the Underdark, the party can be warned about Minotaurs through Rapport Spores. The myconids are a neighbouring regional faction, not residents of the fortress.
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Enemies and hazards
Spectator
The Spectator is the principal set-piece enemy within the outpost’s immediate ruins. Its petrification-related abilities are central to the battlefield encounter, and the drow can complicate the fight if they are restored during combat.
Minotaurs
Minotaurs patrol the wider area near the Storehouse and the approach to the outpost. One may charge towards the gate, where the moonstone artillery can damage it. The Storehouse itself is a separate location, but its wandering Minotaurs are directly relevant to the outpost’s entrance.
Bulette
The area around the outpost is one of the places where a Bulette may be encountered. This is not necessarily a fixed fight that every party experiences in exactly the same way. Treat it as a regional encounter rather than as a permanent resident or named boss.
Environmental dangers
The tremor near the barricades is harmless and primarily atmospheric. It can prompt a party member’s reaction, but it is not itself an attack or quest failure condition.
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Quests and progression
Find the Nightsong
The book In Search of the Nightsong, found at the feet of the Selûne statue, advances the investigation into the Nightsong. The outpost therefore functions as one of the early pieces of evidence in a much larger quest thread.
Reading the book is easy to miss if the party immediately destroys the Moonstone and leaves. Search around the statue before departing.
The Adamantine Forge
The petrified drow encounter is tied to the Adamantine Forge investigation.
The outpost does not contain the forge itself. Grymforge is a separate Underdark location and must not be treated as a subarea of Selûnite Outpost.
Inspiration events
Verified inspiration opportunities connected with the local area include:
Some of these depend on background, dialogue choices and the method used to resolve the relevant interaction.
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Inspiration events
| Event | Background | How it is obtained |
|---|---|---|
| Shatter the Moon | Acolyte | Destroy the Moonstone |
| Last Rites of the Dark Dancer | Acolyte | Complete the ritual associated with Phalar Aluve |
| Secrets of the Matron | Sage | Read On Educating the Faithful |
| Know Your Place | Noble | Particular drow dialogue outcome with Dhourn |
Suggested exploration route
For a first visit, the following order minimises backtracking:
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Suggested exploration route: steps
- 01Secure the interior. Search the ruined rooms and collect ordinary supplies.
- 02Find the hidden wall. Look for the DC 15 Perception opportunity and retrieve Luminous Armour.
- 03Open the locked chest. Take Helmet of Smiting.
- 04Read the Nightsong book. Check the area around the Selûne statue.
- 05Disable the defence. Destroy the Moonstone if you do not intend to use the artillery.
- 06Activate the waypoint. Do this before travelling into the wider Underdark.
- 07Approach the petrified battlefield carefully. Position the party first.
- 08Defeat the Spectator. Try to preserve Dhourn if you want his dialogue.
- 09Search the battlefield. Collect the Spectator Eyes and Dhourn’s items.
- 10Visit the Eilistraee cliff. Claim Phalar Aluve.
- 11Search the web-covered cliff. Loot the Lolth-sworn drow stash.
- 12Leave towards the wider Underdark. Choose between routes towards the Storehouse, Arcane Tower, Ebonlake Grotto or other regional locations.
Practical checklist
Before leaving the area, check that you have:
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Comprehensive named directory
Named waypoint
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Locations and subareas within the guide’s scope
Named items
What is outside the boundary?
The following places are nearby but should not be merged into the Selûnite Outpost:
Keeping these boundaries separate matters because the enemies, factions, quests and loot associated with them are not all located at the outpost itself. The Underdark is a connected region made up of several named locations, and the game’s map can make their borders feel less obvious than their individual location pages suggest.
What is outside the boundary?
| Name | Details |
|---|---|
| Storehouse | a separate Zhentarim-associated storage area with supplies and an elevator connection. |
| Arcane Tower | a separate wizard’s tower to the west. |
| Ebonlake Grotto | the myconid settlement. |
| Grymforge | the major duergar-controlled area containing the Adamantine Forge. |
| Defiled Temple | the upper-side entrance beneath the Goblin Camp. |
| Minotaur Hills | the wider regional area where Minotaurs roam. |
| Dread Hollow | the Sussur Tree region. |
| Decrepit Village | the Underdark beach settlement. |
Sources
- Selûnite Outpost - bg3.wiki — bg3.wiki
- Underdark - bg3.wiki — bg3.wiki
- Selûnite Outpost - bg3.wiki — bg3.wiki