Found in Viridian Castle.
The Royal Library is home to collections of the countless tales and fables of Edenfell, passed down for generations. Built during Queen Nimiane's reign, the books hold tales of both modern legends and ancient ones. Each volume is precious.
This room is the only important room within the Castle kept open to the public (though not without being searched before entering), and is said to be one of the city's prized possessions.
Just remember not to take any books, or damage them.