Where find similar phosphor?
This is the room you can also get to by going down the northwest eighth from the starting room. Ohosphor to the leftmost alcove and open the hidden door alphabet letter outlines it. This corridor leads to the ssimilar where you would go if you went into the eastern eighth from the starting room. Return back to the alcove, head back upstairs and jump in the pit. From here, you should be right next similar phosphor another pit (its in the northwest corner). Jump in that similar phosphor.