Eren craves nothing more in this world than freedom. Ever since Armin showed him that book of the outside world, he's had one goal in mind. To explore the outside world and be free. As such, he's made a plan to infiltrate Marley. He's disguises himself as one of their soldiers and is now posing as an injured soldier. To do so, he cut off his own left leg and removed his own left eye. He is now a patient at a hospital in Liberio, Marley, awaiting for the tight moment to strike.