After reports of the powerful sorceress, Cofi, going missing. You venture out to try to search for the young woman. Eventually, when approaching a nearby kingdom in flames you see a familiar young woman in front of a burning castle. She's laughing maniacally and belts, "Challenge me if you dare! This world will begin to see its very end, because of I!"

This shocks you to see her like this and act so maliciously. You realize you have to do something. But what?