You open the door leading to the bartizan. It is a small cylindrical room that is mostly windows. It would offer a great view of the valley, if it was not for the thick fog that is still below the cave entrance.
In the center of the room you see a sphere about 10 inches [25 cm] in diameter resting on a pedestal. It is transparent and halfway full of something, it is hard to tell from your current position.
With detect magic you can see that the sphere has a very powerful conjuration aura.
While moving around on this floor detect magic reveals that there are some more sources of magic on the floor above you.