So by coordinates 115, 185 there's a chest, a lever, and a stone hatch. This is the area where there are 4 sentinels and a teleporter that takes you to the Alchemst. It's right next to the forest victim that tells you to burn Cassandra's bones to weaken her.

I can't figure out how to reach the chest/lever/hatch area. The platform is raised. I can't teleport to it. Can't throw a pyramid up there.

What is the stone hatch? What does the lever do? How do I reach it.