Iron Dwarf

History
The history of the Iron dwarves lie solely with Loken. While it was speculated that the iron dwarves were a recent creation ("recent" referring to the planetary history of Azeroth and not the personal recorded history of its races), Creteus, a Titan creation in the Storm Peaks confirms this dark turn of events. By taking the Forge of Wills, Loken created an army of iron dwarves from scratch and expelled the Earthen from Ulduar. This is further supported by the presence of Sjonnir The Ironshaper guarding the Forge. The iron vrykul may also be from the same source, stored within the Halls of Lightning. It seems apparent that Loken used the earthen of Ulduar's and the vrykul's basic design but used a different material, namely a saronite-iron composite, to create minions that can only be loyal to him, and by extension, Yogg-Saron.