Caspian, Lucy, Edmund, and Eustace were all on Aslan’s forest celebrating that Narnia was gone of all evil. Aslan seemed to never fully agree that it was gone of all evil, Lucy, Edmund and Caspian noticed. When the sun set and the others headed to bed, Lucy, Edmund, Caspian, and Eustace all stayed for a bit longer. Lucy asked Aslan why he didn’t fully seem happy, Aslan sighed and said “because there is one place that I’ve never explored… due to my own promises.”