Druid: A Tale of the Last City (Book 3) - David Sarachman

After surviving so much, Kel and his companions decide to see what is beyond the newly discovered walls of Horizon. The journey takes them to places that Kel has never dreamed of and yet they seem eerily familiar to him. For Kel, old questions are answered and new enemies rise when they discover that the denizens of Horizon are not the only ones who survived the Fall...