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The Lecture Building is an area in Bloodborne. Notable about this area is that there are two floors to this area, that are accessed in different ways. Floor one is accessed by getting grabbed by Amygdala in Yahar'gul, Unseen Village (the room with the bath where you are dropped off after having defeated Rom, the Vacuous Spider) while having the Tonsil Stone in your inventory, or using a ladder at the far end of floor two. This floor connects to the Nightmare Frontier. Both the Nightmare Frontier and Lecture Building 1F are optional areas. The second floor is accessed by touching the Mensis Cage body in the room behind the area in which the player fights The One Reborn. This floor connects to the Nightmare of Mensis area.