Have you talked to Kerah yet?
If you haven't, search for a southeast passageway off of room with Anephas' altar. You will need to move the statue in front of the passageway to enter. Explore that area and you should find Kerah. From Kerah you need to get a Light Obelisk. Be certain to explore her area complete before coming back down into the pyramid. Once you come back down, you can't go back to see Kerah again.
Wyv
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