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To discover a tresure, Bayek must follow the clues laid out in the Scroll of Thoth.
Bayek finds the Crystal of Thoth at the base of the big tree at the Temple of Thoth in Arsinoe. After placing it on the obelisk on top of the temple, Bayek positions the mirrors on the ground floor so the light reflects through the mirrors on the statues and hits the door. He then obtains the legendary weapon from beneath the tree.