Ygg: Words of Power
A Dwarf, also known as a Duergar, is a race of Svartalfar and racial cousin of the Drow. They are a short, stout, underground-dwelling people native to the realm of Svartalfheim, though not uncommon throughout the other Nine Worlds as their craftsmanship and mastery of artifice is prized by all races.
In D&D Dwarves and Duergar are distinct (though related) races. In Ygg, they are viewed as one and the same, though PCs wishing to belong to the race should follow the guidelines for Dwarf in the Player’s Handbook.