Just travel map go to darkovia forest and go to nightbane's fortress skip the talking with vampire slayer E after get the adveturer darklaw (if you are not a guardian) or the guardian darklaw (if you are a guardian) and take vampire slayer E with you............

reminder:you need lots of potion to go there because it has weredragon , a vapmlord, and the lycanking....and the darklaw will only work its magic through vampires, lycan, undeads,and were's