Loken

Loken was one of the Titan watchers tasked by the Pantheon to watch over Azeroth in their absence. Elevated to the role of prime designate, Loken was the chief jailor of the Old God Yogg-Saron, imprisoned in the depths of Ulduar. However, the whispers of the Death God eventually drove Loken to betray his comrades and bring down the works of the Pantheon. With Ulduar and the Forge of Wills under his control, Loken created an army of iron constructs, such as the iron dwarves that battle the earthen throughout Northrend.