According to the nature of devils, if their direct superior wasn't present, even the bravest and most skilled Duke of Demons would have fled by now.
Devils do not have the conviction to persist in a battle they are bound to lose — that would be too costly!
Only sufficient benefits could make them fight desperately.
In the strictly hierarchical Hell, for these dukes, a direct superior is more terrifying than even the Lord of Hell.
But if they win the favor of this Great Monarch, even if they lose half their power, they would not die in vain, as they would always receive ample rewards.
The Demon Lord would never allow his subordinates to work for nothing like the Lord of the Abyss does; even if he exploits them cruelly, he at least allows them some small benefits.
Perhaps it was because he was certain of this that William had absolutely no interest in going to the battlefield between devils and demons, where it was already impossible for ordinary humans to survive.
