Get Frostgeist Hexe Core

Journal
''So, step three in the mystery of the looking-glass room involves more frostgeist fun. This time, I need to find a frostgeist hexe, defeat it, take its core from its body, and bring it back to Esmeralda. She suggested I try venturing at dusk, far from the confines of the monastery and into Highvale Outskirts proper, to find a powerful frostgeist hexe. Apparently, Six Point Ranch might be a good hunting area.''