The Ultimate Glutton System

John fell asleep. And when he woke up he found himself in the middle of a warzone...... It turns out that magic is real. And humans are now the target of it. The world has been embroiled in a universe-spanning war that is enforced by a system created by a strange entity beyond comprehension. An alien race is waging war against humanity. Humans don't have a hint of magic and are much weaker than the aliens. All logic states that humanity should lose. So then are all the aliens dying? Why are humans getting special systems that have never been seen before? Why is the world covered in an energy beyond mana?