The Last Council: A Graphic Novel (Amulet #4): Volume 4

Emily, Navin, and the crew arrive in the lost city of Cielis, but they soon realize it's not the utopia they expected to find. While Trellis and Luger are taken prisoner, Emily is forced to fight for her life in a series of tests that will determine who among the new generation of young Stonekeepers will join the Guardian Council.