Atiesh, Greatstaff of the Guardian

History
Its date of creation is unknown, but it is known that Atiesh was forged from the "seed of hate" and was wielded by each Guardian of Tirisfal until the line ended with Medivh. This would set the age of Atiesh at thousands of years. Following the assassination of Medivh, the staff was brought to Dalaran where it was held by successive members of the Kirin Tor, who all found their deaths soon (except for highborne sorcerer Tarsis Kir-Moldir, it appears). After all these deaths, it was decided that the staff was to be put "behind impenetrable barriers of magic" and a "watcher" was appointed: Angela Dosantos. The shattering of the staff came about following the destruction of Dalaran by Archimonde, probably due to the failsafe system of the magical barrier. Atiesh was shattered into forty-two pieces which were scattered across all of Azeroth. Brann Bronzebeard held the Base of Atiesh, which he somehow lost to C'Thun. The Scourge captured the forty-one other pieces, twenty of which were initially held by Tarsis. Forty pieces of Atiesh were each entrusted to a different lieutenant of Kel'Thuzad within Naxxramas, while the fallen mage himself held the staff's head.

When Naxxramas appeared over the Eastern Plaguelands, the Argent Dawn attempted to prevent this powerful focus of power from falling into the hands of the necromancer-lich, Kel'Thuzad, and were apparently successful in this regard.