It involves entering a room full of enemies that can. If this was something fabricated by Diablo or if perhaps the Halls of the Blind has been around a long time and infected with Hidden demons or if they were created by some magical mutation of the Tome being there in the first place is open to speculation. Halls of the Blind is an optional quest in the catacombs on dungeon level seven in the original Diablo. It could be just an ancient poem, but the Halls of the Blind is obviously more than fiction. Out of darkness, out of mind, Cast down into the Halls of the Blind.' Then you see what cannot be, Shadows move where light should be. When you turn they will be gone, Whispering their hidden song. The contents is simply an equally ancient poem about the legendary Halls of the Blind, and initiates a quest with the same name as the halls. The Book of the Blind is an ancient Tome in Diablo I found on the 7th level of the catacombs.