Mysterious Arrow

Mysterious Arrows were the second most powerful type of arrows available in, adding 46.5 DPS.

Source
These arrows were sold for outside Karazhan and also in the Aldor and Scryer sections of Shattrath City. Aldor vendor: Marksman Bova (located in the alcove next to the Aldor elevator). Scryer vendor: Archer Delvinar.

They required reputation with the Violet Eye faction.