Dark Knight Mordred:
Well, I suppose you'll have to do... First, visit Spellbook Seller Elena in Goddard Castle Town. After analyzing the ancient documents, she'll tell you what to do next.
Death Lord Hallate is said to be searching for the ancient, forbidden power. I seriously doubt that he would risk going after it in person... He'll probably send his witch Lillian! I've collected as much information about her as I could find and compiled it into this manual. Study it carefully, and keep your eyes open at all times!