Proof of Demise: Keristrasza

Are you familiar with the story of Keristrasza?$B$BHow she was instrumental in the slaying of Saragosa, the mate of Malygos? How, in turn, he took Keristrasza as his consort, freezing her within a block of ice?$B$BWe have become aware that Malygos has been using his magic to break her will. This has driven her insane.$B$B$N, you must go into the Nexus in Coldarra and put an end to her before she can be fully turned.$B$BThough it saddens me, I must insist that you bring me her heart as proof.