Climb out of the abyss.
Walk onto the blood-filled purgatory.
Is it a demon? Is it a ghost?
Become a monster? Become a god?
Finally achieve nirvana.
They came from the dark abyss, carrying the blood of hell, and were reborn in Nirvana. They carried the country's flag and rushed to the front line of the battlefield to defend this country that they originally looked down upon.
Perhaps, you will ask, what changed them.
A history of forging special soldiers, a baptism ceremony of the soul, a silent battle, a battle that only belongs to special soldiers.