Mermen
The Mermen and Mermaids are the mythical inhabitants of the seas surrounding Narnia, creatures who belong to the deep waters and who make a single, ceremonial appearance at a pivotal moment in the country's history. They are first mentioned during the coronation of the four Pevensie children at Cair Paravel, when Aslan solemnly crowns Peter, Susan, Edmund, and Lucy as the new Kings and Queens of Narnia. As the ceremony reaches its climax, the eastern door of the Great Hall, which opens directly onto the sea, stands wide open, and from beyond it come the voices of the Mermen and Mermaids swimming close to the castle steps, singing in honor of their new sovereigns. Their music is distinct from the sounds of the feast inside the hall: it is described as stranger, sweeter, and more piercing, a haunting counterpoint to the gold and wine and dancing of the coronation revelry. This single, vivid appearance establishes the Mermen and Mermaids as part of the natural order of Narnia, creatures who acknowledge and celebrate the rightful rule of the Sons of Adam and Daughters of Eve, yet whose realm remains separate and mysterious, their voices carrying a quality that is both beautiful and otherworldly, a reminder of the vast, enchanted world beyond the castle walls.