[18+] The Bloodiest Crusade (Highschool DxD x M!Reader)

"Whoever fights monsters
Should see to it
That in the process
He, does not become a monster..."

In a world where gods, dragons, magic, and many other supernatural entities exist, the human world hardly know of their existence. Very few do and those who are aware are beings usually treated as equals among the Supernatural. However, there's one particular family that they fear- one that's even stronger than many gods and immortals- and that's the House of the Slayers.

For 500 long years, this family of mortals have been feared among the Supernatural. No one has ever dared to even go near them, let alone fight, kill one of the members, and live to tell the tale. That is until an assassination attempt was made against them for unknown reasons and was successful for the most part. But in the end it was for not, as one member of the Slayers survived, and is now looking to exact revenge. Not only does he want revenge, but he declares to be going on a one-man crusade against the entirety of the Supernatural and will stop at nothing to slay all who oppose him.

How will this end? In one man standing over countless corpses with untold amount of blood on his hands, or the Supernatural killing a mortal among gods?

"Rip and tear, until it is done."