Currently among top-rated titles on EnWorld, The World of Calidar combines two parts: the story of the skyship Star Phoenix and a fantasy campaign setting for use with role-playing games. This new fictional world focuses on air- and space-faring ships, but also explores several concepts, such as epic heroes striving for immortality, sentient planets, world souls providing global magic to the universe, and the ability of people to create their own gods.  The fantasy setting section gives an overview of the Calidar Universe and its central world, Calidar, with a focus on the Kingdom of Meryath, the future home of the Star Phoenix.

World of Calidar is intended as the first in a series of releases, each describing a new adventure for the Star Phoenix and providing an expansion to the campaign setting. This unusual format is inspired from the stories written for Dragon Magazine, Voyages of the Princess Ark, and of course vastly expanded here. These were very popular in the 80s and 90s and a major selling point for the magazine. Although written with role-playing games in mind, contents are non game-specific, therefore easily adaptable to most RPG systems. Guidelines are nonetheless provided in the book for use with the Pathfinder Roleplaying Game.