Defiler's Talisman (level 28)

The Defiler's Talisman is a Horde faction quality PvP reward trinket that can be obtained through Arathi Basin. It is available at various levels, and absorbs a certain amount of physical damage. Along with the Insignia of the Horde and the /, it is one of the few trinkets available to low level Horde players.

Source
The Defiler's Talisman (level 28) can be purchased for from  outside the Arathi Basin battleground entrance.