Open a black door

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Open a black door (from A Guide to What Has Gone Before during Firmament)

•  Spoiler ID: 268996
  

  Unlocked with Firmament exactly 310, The Highest Sanctum exactly 2
  

   

  Success

  Consumption

  •  You've gained 1 x Glass Gazette

  ^

Open a black door (from An Atrium)

•  Spoiler ID: 271816
  

  Unlocked with Library Key, Exploring with the Apostate
  

   

  Success

  Black keys

  •  You've gained 50 x Tantalising Possibility
  •  You've lost 1 x Library Key
  •  You're surviving alongside the Graven Apostate. (Raises Acquaintance: The Graven Apostate by 1, up to 6)
  •  The light in the library is cold, like a moon just hanging over the horizon. (Sets The Hour in the Library: to 10 - An Hour of Cold Pale Moonlight)
    • Wiki note: This is a different level than the usual Hour of Cold Pale Moonlight. It is used to unlock A Solonacean Gallery.
  •  You've gained 10 x Perusing the Stacks (if In Search of Lost Time is exactly 1)
  •  You've gained 10 x Finding the Centre (if In Search of Lost Time is exactly 2)

  ^