Tyr is one of the Titanic Watchers. He once resided at the Temple of Order, but is absent during the time of Loken's rebellion. It is said that no indications of struggle or guardians are present. Tyr is the only one of the Keepers left by the Titans not to appear in the Ulduar complex.
Watcher Tyr was not in Ulduar when adventurers finally freed the titan city from Yogg-Saron's influence. Tyr's current status and location are a mystery.
The story of Tyr slipped into memory long ago, when the young race of humans struggled to survive using the limited supplies provided to them by the parents who had abandoned them. They occasionally took to gathering around a fire whilst trying to read from scrolls telling of ancient heroes and leaders – tales from the civilization that had cast these creatures out. One of these scrolls spoke of a great leader, a paragon of order and justice, who sacrificed his right hand in a fight against an unfathomable evil. Although it was within this hero's power to fix his hand after the fighting had ended, the hero instead chose to replace it with a closed fist made of the purest silver. In this way, the hero impressed upon those who followed him that true order and justice can only be accomplished through personal sacrifice.
In Dawn of the Aspects it's revealed that Tyr lost his hand while fighting Galakrond.
Tyr is named for the Norse god Týr, and their history and experiences are very similar.
His silver hand was most likely inspired by the one mentioned in the legend of Nuada from Celtic Mythology. In the legend Nuada is challenged to single combat by the champion of the Firbolg; The mighty Sreng. Nuada defeted Sreng but not before losing his Right hand to the Firbolg's sword. after the battle, the greatest physician of the children of Danu; Dian Cécht, fashioned a new hand for Nuada from pure silver, enchanting it so it worked much like his original hand.
At one point it was suggested that Tyr may have mutated into General Vezax under the influence of Yogg-Saron. This was later proven false when Blizzard stated that Tyr was not in Ulduar when Yogg-Saron was defeated.