Sword of Serenity

Sword of Serenity is a one-hand sword that is most often sought after by Rogues. It is also a respectable tanking weapon for Warriors or Paladins when paired with a good shield.

Source
This item is a reward from the Alliance quest which starts with Raleigh the Devout in Hillsbrad Foothills. To complete the quest, you must slay High Inquisitor Whitemane, Scarlet Commander Mograine, Herod and Houndmaster Loksey in the Scarlet Monastery.