Nausikaa told you of Koreumtor, the Elim Elder of Wisdom, whose advice might help you get your memories back. The first step in finding him was asking the Elim Trajanus for help. Trajanus told you that the Elder of Wisdom was hiding in Marla Cave after being transformed by Dragon Lord Fregion into a Gnarl. Koreumtor said that your lack of memory actually gave you strength to endure bigger troubles in your future, and advised patience.