Highschool dxd X Op male reader: The Dark warrior of the underworld

There are many tales about devils, Angels and all supernatural things across the world. Many people across the world spoke of seeing devils, angels, fallen angels or anything that is mentioned within the Bible in churches. Some say Devils and Angels are rivals.....that maybe true but in truth, they live in peace together, living among humanity as normal humans like me and you.

Even though there is peace, there is also chaos as many deadly creatures come out from the grounds to start their destruction or take over in hopes to start a war. However all these kind of threats were immediately stopped by a warrior. demons and Angels say there is a warrior who may have lived for billions of year, even far back during the Devil and Angel wars this warrior always survives eveyr battle, every war like he was immortal....or is he?

This is a tale of one of the most strongest and most powerful being to every exist. So powerful in fact, he might even defeat even the most powerful gods to ever lived. He is the warrior that strike fear to those who harm the innocent and those who abuse their demonic magic onto others who cannot protect themselves. He is a warrior who strike within the shadows when you at least suspect.

He is called by many names but one will always be remembered by his enemies and that name is "The Dark slayer" but his real name....is Y/n L/n and this is his tale.