Oathbinder, Charge of the Ranger-General

Oathbinder, Charge of the Ranger-General drops from the Lich King in the 25-man version of Icecrown Citadel.

Speculation
The "Ranger-General" in question may be Sylvanas Windrunner, who was the Ranger-General of Silvermoon when the Scourge attacked Silvermoon City to get to the Sunwell. The skull's owner is unknown. In the present day, Sylvanas uses a sword in melee combat.