Opportunity

From publisher blurb:

Opportunity is a city built, and torn down, by generations of superhumans divided into the warring clubs of the Vindicator Association of heroes and Dark Space of villains. Recently both groups, and the ordinary inhabitants of the city, have been forced to adapt to their dramatic new circumstances as war with a mysterious subterranean empire transported the city to a great sea of magma.

Opportunity is an official setting for Superlatives and was a stretch goal for the Kickstarter campaign. It includes:

A full description of the eponomous city and the factions which war over it.
Twenty two new characters.
The adventure The Mions Return which pits characters against these mysterious creatures.