Become the Demon King and rule all demonkind!
Of course, having demons for subjects isn't easy. It takes ruthless ambition and an ability to keep your infernal citizens from getting bored. It used to be you could just send them to plunder, but times have changed, and as fun as the old ways were, they won't cut the mustard anymore.
Mass production has come to the netherworld, and you'll have to interview demons to hire, abduct the right humans, and build up your arsenal of weapons!
As a candidate to become the next Demon King, get in there and employ demons and show the netherworld your diabolical yet efficient managerial skills!