The Book of Invisible Ink

I found a mysterious book deep in the Aquarium sea while exploring. It is Bowman-related and mentions mastery of a skill known as Eye of the Heart. There's also a fading inscription about obtaining something from the book itself. Could this be a skillbook? I must find out! Wiz the Librarian knows a lot about books. I should ask if he can decipher anything useful from this book...

Start with Wiz the Librarian in Helios Tower <Library>

Level

Any

Job

Bowmaster, Marksman