Archus, Greatstaff of Antonidas (heroic)

Source
This item drops from the Lich King in the heroic 25-man version of Icecrown Citadel.

Speculation
In the Cycle of Hatred, it is mentioned that Jaina Proudmoore received an ornate wooden staff from Antonidas. This could be Antonidas' personal staff, but that's highly doubtful.