The One Who Wrote the Letter

I found out more about the letter that Lavine found while you were away, [Character name]. A noble I am close with helped me to match the handwriting to that of an author of one of the works at the Great Library of Calpheon. The author must've been someone important seeing how his writing was kept at the Great Library of Calpheon. Unfortunately, it looks as if the author of the letter lived about a hundred years ago and is no longer alive. He has a living descendant though. From what I've heard, he became a bit of a hermit. He lives in Lake Kaia and makes a living selling fish to Catfishmen. Why don't you talk to him?

I heard that he became somewhat of a hermit and was last seen at Lake Kaia.

You don't look like one of my usual customers. Are you really here to buy fish? ...What did you say? How did you come across this knowledge?