Set a course for the Midnight Moon (Hallow's Throat)
From Fallen London Wiki
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From: Send Word to the Midnight Moon
Upwards. Always.
Unlocked with 
Firmament exactly 90
Success
Upwards. Again.
[…] "The ink requires dust of violant to see," he says, producing a bottle. […] He gazes at the paper and frowns, before handing it to you.
[…] "Send them. It comes from within. Ambergris mills —" […] the rain that bedevils London below comes from the Midnight Moon.[Find the rest of the story at https://www.fallenlondon.com]
You have a new Accomplishment... Discovered: The Midnight Moon!
You have received an answer from the Moon. (Sets 
Firmament to 100)
