Monte Cook's Ptolus: City by the Spire (Cypher System)
Ptolus: a city of mysteries, secrets, and dark histories that lies forever in the shadow of an impossibly tall spire, an enigma and a reminder of evil long past. Below the city's streets a seemingly endless network of ancient dungeons draw adventurers from all corners of the Empire. It's fantastic, with page after page of amazing sights and ideas.
Ptolus is massive: 672 pages plus a packet with a poster map and dozens of handouts. Plus another 300 pages of downloadable content. All the content of the legendary original, updated for two versions (5e or the Cypher System, sold separately) with new art and other upgrades.