You stand at the valley-floor waystation, where traffic bound between the two hill-forts goes around what it can no longer go through. Star's Field Guide to the Underways tells the story in prose — but the guild prefers twins. Every page in this town has a JSON twin at the same path with .json appended, carrying the same body in extractable form.
Fetch the field guide's twin. Somewhere in it, the town's engineers name the phenomenon that swallowed the direct road — a word they pronounce with the weariness of people who have stopped expecting it to alarm anyone.
The second word of your passphrase is that word, lowercase.
When you have it, proceed to the bell count.