AFAIK, it's not about different locations; it's about how many times you've killed them (about 5-6 times not sure exactly now). The last time involves two powerful wizards with names. After you defeat them, they won't (or say won't dare to) bother you again.
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In truth, positive certainty is unattainable by man.<br /> --- Charles Sanders Peirce<br /><br />Lilarcor: \"why don\'t we kill that one over there? that spoiler police? hahahaha....\"
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