 Some of Eren's friends are also revealed to be able to transform into Titans and had been sent as spies by an unknown party to find something called "The Coordinate". It is later confirmed that the Coordinate is the power to control other Titans at will, and that Eren holds that power. The royal family and the Military Police track Eren and his friend Krista Lenz, who is actually Historia Reiss, the successor to the real king, Rod Reiss, as the current king is but a figurehead.
