"Holy Spirits vs Evil Spirits"
The body sizes of these big shots were rarely gigantic, but their energy alone was enough to nearly destroy the gate if they insisted on coming out when the gate only opened a slight gap.
Still, the moment these low-level fighters came out, both sides immediately started the final war, and the big bosses commanded the small soldiers to fight at the border.
[Kill! Those who have a stronger resistance can go deeper into the enemy's domain but don't die a vain death!]
Lucifer and Michael both sent these creatures to fight each other while also starting to attack the opponent's domain.
For this, half of the creatures that came out of the gate stayed inside their prospective domain, waiting for the enemy to attack because they had to defend their 'home ground'.
The two big bosses had started the fight with the low-level creatures from Hell and Heaven.