Souvenirs of Death

I hear you were enlisted by Darthalia to wage war on the humans of Hillsbrad. So jealous I am. . . While you're off having all the fun -- slaying humans, pillaging the town, terrorizing innocent people -- I am stuck standing guard here in Tarren Mill. Perhaps you'll take pity on an old Deathguard like myself? You see I am collecting human skulls. And you will be fighting humans for quite some time. Over the course of your long battle, bring me 30 skulls and I will make it worth your while.