The Inviting Fires of Demons - S1.E18

After escaping from the Inspectors, Shadow Mirror, and the mysterious monster, the captain of the Hagane, Daitetsu, falls. Excellen and the Weissritter are captured by the monsters, and Kyosuke is wounded in his battle with Axel, and his Alt Eisen crippled. The monsters, who are now called "Einst", attack military bases all over the world, causing even further chaos. Meanwhile, Excellen and the Weissritter are changed by Alfemi. What are the Einst after