A little over two hundred years ago, the Demons declared war on the forever devils.
The Demon Horde and the Forever Devils began their clash on the third plane of the underworld. The horde was led by their supreme commander, the most powerful of the Seven Princes of the underworld, Beelzebub.
The Forever Legion was of course commanded by the Forever General, Kai Syaoran's mother in this life.
Beelzebub was also accompanied by Mammon, the sin of greed.
The Demon Horde was over one hundred million strong and the Forever Devils were greatly outnumbered.
Since the Forever Devils had just finished establishing an alliance with the tribe of Klang of the Sky Wolves, they received some reinforcements from the wolves but this was still not enough to match the force of the demons who were determined to end the Forever Devils.