Answered in season 4

What’s under Crown Hill?

The gold cracks a Shredquake leaves in the street fade by morning. People swear they still hum.

The answer

Crown Hill is a vein of golden crownstone, a rock that carries sound the way water carries ripples, and a century of midnights soaked into it. In season 4 the crews find the crownstone caverns under the hill.

File

First hinted
At launch: gold cracks that hum
Answered
Season 4

Connections

Crown City’s waiting.

And it’s way too quiet.