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Go down to the door and use the Shadow Demon Claw to open it. Go in and
follow the path. You will come to a pond, with a round stone in the middle
with a flaming pedestal in the middle of it. On the far wall you will see a
switch you can hit. There is also 3 more switches you stand on, to the left
of this switch, and a book to the right.

Read the book, it tells you what to do. We need to put that flame out.
If you look at the 3 floor switches, so that the other switch is to the
right, the switches do the following:
Left switch - rotates the 1st and 3rd rows
Middle switch - rotates the 1st and 2nd rows
Right switch - rotates the 1st row

You need to rotate the rows so that the symbols line up and put that flame
out. If you are having trouble lining them up, look to the left and right
symbols to help you.

Once you have done this, go to the pedestal in the middle to get the Anubis
Stone piece. Watch the cut-scene. See those 'things' that come out? You need
to kill those now!