Ptolus

Ptolus is a campaign setting for the Dungeons & Dragons role-playing game written by Monte Cook for Dungeons & Dragons (v3.5). It spans a huge "City By the Spire" and the core Ptolus book and supplements weighs in at well over 1000 pages. Ptolus was used as the earmark to the creation of D&D's 3rd Edition. It was the QA test bed for rules, the supplication of NPCs and the creation of tales that would help shape 3rd edition in to what it is.

The world of Ptolus is called Praemal. 80% of its surface is covered with water, and it is currently in an ice age. The planet has two visible moons, and allegedly a third that disappeared eons ago. Ptolus focuses on the city of Ptolus instead of an entire land. While some details about outlying areas and politics are included, the bulk of the book is dedicated to the streets, people and intrigue of Ptolus itself. The campaign centers around the city of the same name, which lies on the Whitewind Sea at the edges of the crumbling empire of Tarsis. The city lies in the shadow of an impossibly tall and narrow spire. Below the city are many dungeons, including the city's sewers and a forgotten dwarven city named Dwarvenhearth.