Cousin Twice Removed

You bend over and break off a branch of the thorny shrub, its sap dark red like blood. A nearby dark elf resting against a rock looks up at you, "Careful now, you wouldn't want your blood to mix with that sap. The Darkthorn Bramble won't kill you, but I daresay you might be driven to cutting off your hand out of agony. That shrub is the perfect reflection of what our traitors kin are capable of. When we were whole, there was no pain, but broken in two our bloodlines can never mix again. The pain they have caused our people leaves us no choice but to cut them off. You see, this broken land is the result of their treason. If you wish to join me in the pursuit of vengeance, then let us strike now, strike here."

Reaver Arkandar has some vendetta against a Vaelyn Thunderhoof, though you do not yet know why. Slaughter your enemies in the Shadowlands, Ellyrion, or the Phoenix Gate until you find any signs of Thunderhoof. Return to Reaver Arkander in Oath's End in the Shadowlands when done.