In Baldur’s Gate 3, you will find the optional quest to solve The Thorm Mausoleum Puzzle. To attempt this, players must go out of their way to find the quest and net multiple rewards, including different artifacts.

Thorm Mausoleum is a dungeon with a dark secret you find out, making attempting this puzzle worth it. It is recommended that you recruit Shadowheart and Astarion in your party for this puzzle, as it will give you more stories about the origin of Shadowheart and increase Astarion’s quest line. If you want to challenge yourself, this puzzle is the one you must go out of your way for. This guide will tell you everything you need to know about this dungeon.
Where Is Thorm Mausoleum Dungeon Located?
If you travel Northeast from the Shadow-Cursed Lands, you will come across Thorm Mausoleum after passing the House of Healing. You will find Raphael standing outside the dungeon, who will ask you to help solve a problem upon interaction. He will take you inside the mausoleum where the puzzle starts. [Source 5]

How to Solve the Thorm Mausoleum Puzzle?
Collect Hints
All the puzzle depends on collecting hints from multiple rooms in the mausoleum. Once you’re inside, you must collect the following items for hints:
- Diaries of Malus Thorm: You will find the first diary in front of the desk in the room on the left as soon as you enter. The second diary is located near the closed tomb.
- Stained Book: Found on the desk in the room right from the mausoleum’s entrance.
- Temple Map: Found on the desk in the room located on the north. This room can be identified as the one between the two coffins.
Disarm Traps
Once you have collected these hints, you must head to the room where the coffin is empty. You must be careful while entering this room as there are many traps hidden that can hinder your course of solving the puzzle. Tread slowly into the room to the marble plates at the entrance’s left and right. Once you have disarmed these plates, it is time to disarm the square stepping plates found on both sides of the room but in the center of the pathway.

Press the Buttons Beneath the Pictures
Once you have disarmed these traps, you can put yourself at ease as the most tricky part of the puzzle is over. This guide simplifies the next step, so you don’t have to connect the dots yourself from the collected hints. Find the pictures in the room, each with a button beneath it. You must press these buttons in the following order: Moonrise Towers, Grief, and General.

Note: Failing to press the buttons in the correct order will fill the room with black void fog that will blind your character temporarily and unleash the swarm of bats on you.
Head Down the Unlocked Path

Pressing the correct order of buttons will open a doorway on both sides of the General picture, and you can go through any of them to continue to Shar’s Sanctum and find the Nightsong.
With this, Raphael’s quest ends, and you will have gained multiple special rewards for going through the trouble of solving a quest out of your way.