Long ago, in the city of Keresh, there existed an order of clerics known as Paeans, endowed with incredible healing powers. Recently, the order has resurfaced, restructured around Tul-Sith, and simply calling themselves 'Priests.'
Priests learn some very powerful healing and curative spells, but are dedicated to their paths of peace and honesty, and so never learn attack spells, or most warrior or rogue skills. They are less item-oriented than Clerics, and so do not learn many item-oriented abilities, or learn them later.
Their Prime Requisite is wisdom. Priest trainers will not teach the Holy Disciplines to anyone who is not worshiping Tul-Sith, and Priests must maintain a high alignment for these spells to work their best.