Treat with the Calendar
From Fallen London Wiki
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From: The Calendar in Strength
One last time.
Unlocked with 
Firmament exactly 600
Success
Oncoming storm
The Calendar is already mustering its forces[…]. The Calendar are armoured […]
[…] They step aside to let you through. […]
[…] "An end to the tyranny of what was, what is, and what is ordained."
[…] "[…] The Calendar will be ready." […] "An end to all tyrants." And they let you go.[Find the rest of the story at https://www.fallenlondon.com]
You are granted permission to go. (Sets 
Firmament to 605)
