As Matthias begins constructing the barrier the demons attack, forcing Matthias to put Lurie and Alma in charge of defending the city while he and Iris begin distributing adamantine to complete the barrier. The students hold back the demons while Lurie crafts an arrow for Alma capable of defeating the first demon to attack. Following his death more demons arrive but Matthias, having finished the barrier in time, defeats them then activates the barrier, preventing demons from being able to enter the city ever again. Unfortunately, while the demons are defeated their army of monsters, summoned using another Dragon Vein Pillar, is still outside the city...