Naked self promotion, which unfortunately has nothing zo do with the question from the OP. The hidden entrance to Cassandras bones was not the question.
Regards,
Thorsten
I don't understand the criticism. This is copied directly from the walkthrough:
It is possible to enter the blocked-off stairway leading northwest by using the Teleporter Pyramids, but the area is completely empty. If you like to try, go to the west of the wooden bridge and throw a Teleporter Pyramid in the slope to the north of you (56, 115). Teleport to it and your party will end up on the stairs, but you might not be able to retrieve the Teleporter Pyramid. If that is the case teleport to Homestead or another map to automatically pick up the Teleporter Pyramid.
Isn't that what we are talking about?