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.
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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.
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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.
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Defeat the Boss spider – Phase Spider Matriarch circling around the giant pit.
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Once the Matriarch is dead, climb down to the giant hole in the middle. you’ll find sparkling purple Dark Amethyst among the bones.
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Use the Dark Amethyst to open the Necromancy of Thay.
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