Qadira, Gateway to the East is a bit unique. It got delayed by the Paizo "snowpocalypse" of 2008, and its revised release date placed it much closer to the release date of the Pathfinder RPG Core Rulebook. Rather than publishing a regional sourcebook and follow it a month later with the new rules, we secretly replaced its regular coffee with... I mean, secretly updated all the rules content to the Pathfinder RPG. So, technically, Qadira is a preview of Pathfinder that's available right now... we just kept it a secret.
Qadira is a cool book, especially if you like adventures in the style of Aladdin, Ali Baba, and Sinbad. The book gives the history of Qadira, its political climate (internal and external), a geographical overview, an in-character Qadiran perspective on the races and character archetypes of Golarion, the city of Katheer, Qadiran magical studies, feats, the daivrat prestige class (why force genies to do your bidding when they'll do it willingly for you?), and—of course—new traits! It's also the only Pathfinder Companion with monsters instead of a regular Persona column—but given the unique role of genies in Qadira, these "monsters" may actually be relatives of Qadiran PCs, whether a half-janni or the suli-jann. And every daivrat needs a little zhyen genie buddy! Just treat them nicely or they may turn into a cruel prankster called a jocta...
