The Clockwork Sun
From The Fifth City Wiki
"Sunlight seeps like syrup through cracks in the stained-glass ceiling. The floor shudders in time with the churning machinery far beneath your feet. The air has a tang of chemicals, bonfires and rain.' "Pistons pump, cogs turn, and suit-swaddled figures tend to the enginery, bellowing over the shrieking metal."''

The Clockwork Sun is the Dawn Machine 2.0: an actual, functional artificial Judgement! Its power allows Empress Victoria to preside over time itself. A museum of sorts was built inside this Sun, but unfortunately it had to be abandoned due to the dangers of sunlight. Now it's mostly a prison, containing (perhaps) star-corrupted individuals known as the Half-Glass - exactly what they sound like.