Kurono’s plan was to fight along with his fellow adventurers the crusaders for seven days at Alsace Village in order to give time for the refugees to escape to Spada. Kurono knew that it is not possible to win the war with just 120 adventurers against an army of more than 15,000 crusaders and his main goal was to only stall the crusaders for a week and then escape to Spada along with the other adventurers. This plan got backfired because of a certain Apostle.
The 12 Apostles are the strongest forces of the Crusaders. Each Apostle is the strength of more than 10,000 soldiers of a king's entire army capable of slaying even a high-level dragon in their full strength. Apostles are also way older than they look for example Sariel is more than 50 years old and the 2nd Apostle is more than 200 years old. Some of the apostles are more than 100 years old. Among the hierarchy the top 4 apostles are considered mysterious among themselves. The 11th Apostle Misa is the Apostle that Kurono hates the most. (The girl from chapter 14 in the manga)
11th Apostle Lord Misa is a mage and is capable of flight magic which is a high-level magic spell, thus she was able to pass the adventurers without fighting them and went straight to where the refugees were fleeing. She is responsible for committing a massacre by slaughtering at-least 9,900 refugees while they were escaping from Daidalos kingdom to Spada kingdom. After slaughtering the refugees she then kills all the 100 adventures such as the skeleton guy, the ninja girl and the werewolf named Vulcan and the 3 elven sisters. She is also a fanatic towards the white god and will kill anyone whom she considers a heretic and looks at all demi-humans as demons.
She has a powerful spell in which she can mind controls the werewolf Vulcan and makes him kill his own comrades in a sadistic manner. Then she kills Vulcan by making him kill himself by his own sword. Vulcan dies with hatred and malice towards the Apostle Misa which results in his hatred getting transferred in his own weapon becoming a cursed weapon. Later in the future arc, Kurono will decide to take Vulcan’s sword for himself which has now become a cursed sword in order to use it to avenge the werewolf’s death in the future.
This war will end in a defeat and the Crusaders will occupy the entire Daidalos territory. Kurono also loses an eye in this arc when he fought the Apostle Number 8 Ai. (the girl from chapter 13 in the manga).
Only four adventurers survive this war and reach Spada i.e., Kurono, Lily, Fiona, and Simon. Out of the 10,000 refugees who were fleeing only 50 to 100 of them survive and reach Spada.
After this arc the story gets epic and MC will encounter the Demon King of the ancient era who is now a God and he also gets a new eye from the Demon King which has some secretive power. He will also be given 7 trials which he has to pass in order to get new powers (Blessing) which involves killing a rank 5 monster in each trial. Each of these trials that the MC passes will give him a special power (Blessing) that he has figure out on his own and train himself in order to get stronger.