Dark Iron Dwarf

The Dark Iron Clan is one of the three primary dwarven clans, along with the Bronzebeard Clan and the Wildhammer Clan. It was formerly led by Emperor Dagran Thaurissan, and it is currently led by his widowed wife, Queen-Regent Moira Thaurissan, in stead of their son, Dagran Thaurissan II.

History
The earliest known Dark Irons were led by Sorcerer-thane Thaurissan prior to the War of the Three Hammers, and when he tried to wrest control of Ironforge, he failed, and left with his followers, going south until he reached the Redridge Mountains. There, he built the city of Thaurissan, from which he led his clan.

But while he and his clan led a prosperous life, he vowed revenge against the other two clans. He and his wife, Modgud, simultaneously attacked Ironforge and Grim Batol. While they failed in breaching the cities, Modgud cast a dark spell on the Wildhammer capital, and they never used the city since.

In a last ditch effort as he is swarmed by the dwarven armies, he attempted to summon the great force that layed dormant below the Red Steppes: The firelord, Ragnaros. While he was killed in the sumonning, his clan was enslaved by the firelord, and many still are as of this day.

In the years after the war, most of the Dark Irons remained the minions of Ragnaros, based in the Blackrock Mountain, where their capital of Shadowforge City lies. However, a group known as the Thorium Brotherhood broke off, and have been declared enemies of the clan. They are also suspected to have an involvement in the taking of Gnomeregan, as several members and even an ambassador are found within the city.

As of the Shattering, the clan is no longer united. While Shadowforge City is loyal to Moira, another group of Dark Irons remained loyal to Ragnaros, Deathwing and the Twilight's Hammer clan. However, this faction of dwarves is small at best, and was most likely thinned to even smaller numbers following Deathwing's defeat.