Nightmare Headstone

Nightmare Headstone in Bloodborne is what the player uses to travel from Hunter's Dream to the following locations:

Nightmare Headstone

Nightmare Frontier
Lamps	Nightmare Frontier, Amygdala's Chamber
NPCS	Patches the Spider
Bosses	Amygdala

Lecture Building
Lamps	Lecture Building, Lecture Building 2nd Floor
NPCS	Patches the Spider
Bosses	--

Nightmare of Mensis
Lamps	Nightmare of Mensis, Mergo's Loft Base, Mergo's Loft Middle, Wet Nurse's Lunarium
NPCS	Brain of Mensis
Bosses	Micolash, Host of the Nightmare, Mergo's Wet Nurse