Shadow Priest Sarvis wants you to kill 8 Mindless Zombies and 8 Wretched Zombies.
We Forsaken are at war with the Lich King's army of the Scourge: necromantically raised armies of the undead, foul beasts of the north, and tormented spectres.
The northern part of the village has become overrun with the Mindless Ones, and they must be destroyed. Destroy them, show them no mercy, our former brothers and sisters as they might be. The Fallen are nothing but The Lich King's slaves.