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The Mason's Guild

Baldur's Gate 3 guide · The guildhall containing secrets of the town ✓ Checked against sources
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Situated in the Shadow-Cursed Lands within Reithwin Town, the Mason's Guild contains the tragic history of the local stonemasons who rebelled against Ketheric Thorm. Explorers can search the upper workshops and utilize a hatch or elevator to reach a subterranean headquarters connected to the Selûnite resistance. Delving deeper requires unlocking a hidden stone wall to confront lingering spirits and uncover the Mason's Log detailing a sinister pact with Raphael.

Region
Reithwin Town, Shadow-Cursed Lands
Levels
Level 7–9
Getting there
North from the central Reithwin Town square and tollhouse bridge across the paved plaza, just east of the House of Healing (X: -105, Y: 5)
Connects to
House of Healing, Reithwin Town, Grand Mausoleum
Related quests
Investigate the Selûnite Resistance
Enemy types
Shadows · Wraiths

The short version

What matters

  • •Infernal Iron in the backyard at (X: -102, Y: 18) for progressing "The Hellion's Heart" and "Forging a Heart".
  • •The Helmet of Arcane Acuity inside the trapped, locked gilded chest behind the altar table.
  • •The Mason's Log on the underground stone table for the quest "Investigate the Selûnite Resistance".

Common mistakes

  • •Casting area-of-effect spells near the stone table during the shadow ambush, which can destroy the Mason's Log quest item.
  • •Rushing into the basement hallway without checking for traps around the gargoyle statues and the 250 kg gilded chest.
  • •Missing the hidden button at (X: 123, Y: -739) in the eastern gallery, which conceals a room holding valuable scrolls and potions.

What you can skip

  • •Attempting to corner Korrilla near the central gate, as she always vanishes upon approach.

Walkthrough

The area in the order you play it. Tick things off as you go: they tick off in the checklists below too.

  1. 1

    Outside the Gates

    Approach the Mason's Guild in Reithwin Town from the ruined bridge, the town square, or the vines leading down from the graveyard. Near the central gate at (X: -110, Y: -20), you will spot Korrilla keeping watch, though she promptly teleports away if you draw near. Head into the backyard at (X: -102, Y: 18) to grab a piece of Infernal Iron sitting openly on the dirt.

    Watch out: Remember to grab the Infernal Iron outside before heading indoors, as it is needed for Karlach's personal quests.

  2. 2

    Hallway Traps

    Advance down the basement corridor toward coordinates (X: 104, Y: -700), taking care around the guarding Gargoyle Statues. Here you will encounter a heavy 250 kg gilded chest that is rigged with a trap. Carefully bypass or disarm the hazards before moving into the expansive hall ahead.

    Watch out: Watch your step near the gargoyles and the 250 kg gilded chest, as careless movement will trigger the traps.

  3. 3

    The Ambush and Meeting Table

    Move down the Mason's Hall toward the long stone meeting table, which immediately triggers a surprise assault from a Wraith and five Shadows leaping from the main floor and side galleries. Defeat the undead while keeping destructive magic away from the chamber's furniture. Once clear, read or retrieve the Mason's Log from the stone table to progress the investigation of the Selûnite resistance.

    Key fight: Ambush at the Selûnite Resistance Hall

    Watch out: Do not cast area-of-effect spells near the long stone table during the battle, as they can destroy the Mason's Log.

Checklists

Don't miss 0/3

Items

0/3

Secrets

0/2

Key fights

Ambush at the Selûnite Resistance Hall

Enemies: 1 Wraith and 5 Shadows

Threats: Life Drain (Wraith reduces max HP), Shadow Blend / Invisibility in dim light, Strength Drain (Shadows sap Strength on hit, causing death if it hits 0), and high Necrotic damage

Weaknesses and resistances: Vulnerable to Radiant damage; resistant to Acid, Cold, Fire, Lightning, and Thunder; resistant to non-magical Physical damage (Bludgeoning, Piercing, Slashing); immune to Necrotic and Poison

Tactics: Keep the party on the elevated side galleries for high ground, illuminate the hall using the *Daylight* spell or the Blood of Lathander to strip their shadow concealment, funnel them through the central stairway chokepoint, and burst them down with Radiant AoE spells (*Spirit Guardians*, *Turn Undead*)

Rewards: Mason's Log (concludes the *Investigate the Selûnite Resistance* quest) and access to a trapped gilded chest containing the Helmet of Arcane Acuity.

Tips

  • You do not need to burn lockpicks on the basement's secret Keyholed Herald if you obtain the Tower-Shaped Key from Mattis back at the Last Light Inn.

Not listed for this area: enemies, shops and people.

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Facts from bg3.wiki (Mason's Guild), written in our own words. Licence: CC BY-NC-SA 4.0 or CC BY-SA 4.0.

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