From publisher blurb:
This is not a stand-alone campaign setting—it is a setting upon which material from your entire library of 4th edition campaign settings can be applied. The Alluria Campaign Setting Guide works as a framework upon which eclectic Dungeon Masters can build a widely diverse world. It provides a backdrop in which multiple worlds intermingle, characters that would not normally interact do, and culture is no longer a barrier. Best of all, it ties in all of the unique and wonderful creatures of Alluria Publishing’s Remarkable Races line with all of the most popular core races. So if you want a fun and interesting way to explain why your party’s warforged artificer, drow sword-mage, and zif explorer happen to be adventuring together, pick up the Alluria Campaign Setting Guide today!