This isn’t about a war.
It’s about two brothers that loved each other, and betrayed each other.
Why do you think you two are the vessels? Think about it. Michael, the big brother, loyal to an absent father. And Lucifer, the little brother, rebellious of daddy’s plan. You were born to this, boys. It’s your destiny. It was always you. As it is in heaven, so it must be on Earth. One brother has to kill the other.