This Web article on Dwarves mentions the Urdvaergs:
Extremely rare to be seen, an Urdvaerg is almost regarded as a half-god by other dwarves. It is said they live for thousands of years and that they master every fighting technique possible, as well as the powers of the runes and smithy. They are even told to be able to see the near future. Those few that are allowed to become an Urdvaerg's disciple are destined for great deeds that will change the course of the world. An Urdvaerg prefers to live alone and is seldom seen in any of the dwarf keeps. The three greatest lords of all dwarves, Dvalinn, Durinn and Motsognir are Urdvaergs.
Is more information about this race's statistics, special abilities, and background available elsewhere for D&D 3.5e? If no further information is available, what statistics and special abilities would be appropriate?