Last Demon Lord - Demon Lord of Darkness

As the last Demon lord, the demon lord of Darkness. All your Friends(other demon lords), have been slayed by a singular mortal said to be the hero that will bring peace to the world. Now this... This scenario is definitely made by me! I mean look at the description, it looks very man made! Also, don't make me a loser for using AI. I don't even use it! Anyway Enjoy the Scenario!