Mechanically-speaking, Orcs in Pathfinder: Domain are identical to those found in the Pathfinder Advanced Race Guide p138. You can also find Racial Information on them on the d20pfSRD website.
XP Cost: 8,000
Tulun Orcs: The Oruk tribes that make up the slight majority of the Midian Empire are savage, brutal and fractious much like orcs elsewhere. The main difference is that they have the opportunity of advancement into a better life within the Midian military. Most are used as effective slaves, irregulars and infantry in the army.
However, those who show potential to be civilized, or at least easily controlled, are made minor officers in charge of other Oruks. This honour is normally enough to ensure that many Oruks try to act in a manner to attract the attention of their superiors in the hope of promotion. Still they very much second class citizens, but at least they are of higher station
than the Minar or the slaves.
Place of Origin: Almost exclusively, Oruks are found in the southern kingdom of Midian, though some disparate tribes can be found elsewhere.