Mechanically-speaking, Strix in Pathfinder: Domain are identical to those found in the Pathfinder Advanced Race Guide p200. You can also find Racial Information on them on the d20pfSRD website.
XP Cost: 11,000
Tulun Strix: The flying humanoids known as the Strix were initially allies of convenience with Midian, but have grown to become important members of the Empire. They were originally native to the mountains that became part of southern Rhakor, but were driven out by human miners and settlers backed by Rhakor military. When Midian first invaded Rhakor centuries ago, they offered assistance to the Strix to help reclaim their land. Their initial gains were later reversed when Enotian forces helped the Rhakor forces re-take ‘their’ lands. These two invasions by Rhakor and then Enotia fuelled a hatred within the Strix towards the humans. Once displaced again, the Strix accepted a place in the Southern mountains of Midian and as airborne infantry in the Midian army
Place of Origin: Originally inhabitants of Rhakor, the vast majority of Strix are found in the southern Kingdom of Rhakor.