This article will guide you on how to unlock the Ancient Tome Book: Necromancy of Thay Key in Baldur’s Gate 3. To open the Necromancy of Thay, you need to find a key called Dark Amethyst which you can find in the Whispering Depths.
Make your way to the Blighted Village.
Interact with the old well in the town square until you are offered the choice to climb down. This will transport you to the Whispering Depths.
Whispering Depths is a series of underground caves filled with Phase Spiders. Inside Whispering Depths continue on the narrow path to the northwest until you find a huge hole.
Defeat the Boss spider – Phase Spider Matriarch circling around the giant pit.
Once the Matriarch is dead, climb down to the giant hole in the middle. you’ll find sparkling purple Dark Amethyst among the bones.
Use the Dark Amethyst to open the Necromancy of Thay.
