Race - Dwarf
The dwarves derive from the earthen, a prototype race of humanoid creatures consisting of living stone. The earthen were one of the races created by the titans in order to help shape Azeroth after the titans were gone, a so-called “Subterranean being matrix”. As creations by the Vanir-titans (probably Khaz’goroth), the part of Azeroth the earthen were to shape was the earth and underground. Although the earthen was a successful creation at first, things would soon change. The Curse of Flesh created by the Old Gods affected the earthen, causing them to mutate into the vicious troggs. As the troggs had a very reduced cognitive ability compared to the original earthen (and other unfortunate aspects the titan’s didn’t find pleasing, such as cannibalism) the troggs were sealed away, primarily within the ancient Titan city of Uldaman.
Although the earthen were susceptible to the Curse of Flesh, the Titans chose to modify the prototype rather than begin all over again. This modification created earthen referred to as “Series Two”. These earthen did not transform into troggs, but into dwarves. While the transformation turned their physical bodies mirroring the stone found on Azeroth into weaker flesh, they still maintained their mental affinity for it, along with their cognitive abilities. The dwarves were actually akin to a return to the default subterranean being that the Titans typically created. This had not been the titan’s intentions and they would continue to modify the earthen, but they were satisfied with this outcome, seeing the dwarves acceptable to carry out their task in their own right.