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Sentinel: Descendants in Time Hints
I've opened the main building -- where's the crystal?
1 of 9: Make sure you've entered the building fully...
2 of 9: ... because as you do, you enter an elevator, and are taking to the upstairs of the building.
3 of 9: Explore that area -- there's not much to see...
4 of 9: ... except an opening in the hallway, with a flight of stairs that leads down...
5 of 9: ... to Dormeuse/Tamara, and another cut scene.
6 of 9: After the cut-scene, you can explore around, but the crystal is not here.
7 of 9: Go back up the stairs, and return to the elevator. It will take you up to another level.
8 of 9: Walk around the hallway to the far side of the floor, and you will find the Argannas crystal.
9 of 9: Take the crystal, return to the elevator, exit the building, and use your transporter to return to Tomb 35.