Mechanically-speaking, Undine in Pathfinder: Domain are identical to those found in the Pathfinder Advanced Race Guide p174. You can also find Racial Information on them on the d20pfSRD website.
XP Cost: 7,000
Tulun Undines: Of all the people of Kajir, the Undine are perhaps the most varied and yet, also the most accepting of others – especially outsiders. Along with the Suli, the Undine are the diplomats of Kajir but they also make up many of the merchants, courtiers, counsellors and guides. Their affinity with people and their wily natures mean they are always found where people are, catering to their needs, gaining their confidence and filling the gaps in society which often go unnoticed. Like the water element they venerate they are interested in change and the ebb and flow of society, but prefer change to be subtle and constant rather than dramatic and destructive but, like the ocean, they are more than capable of it if pushed.
Place of Origin: Originally from a plane of existence consisting mainly of water, the Undine were pulled into Tulun during the time of The Reckoning, and most can be found in the kingdom of Kajir where so many opportunities are available and equality is king.