City of Souls

The City of Souls is a city in the Underworld that appears in Chapter 22 of Kid Icarus: Uprising. It is the city that Dark Pit must fly through in order to reach the Rewind Spring, where he can revert the singing of Pit's wings in Chapter 21 by rewinding time. While flying through the city, Dark Pit must defeat many enemies affiliated with the Underworld Army, including a mid-stage boss, the Soul-Eating Monster, which, as Palutena explains, is the monster that eats the souls of the dead.

The city was a place where souls would gather to find their final resting place, but Hades prevents them from resting by turning them into monsters and making them fight Palutena's Army and the Forces of Nature.