An Eternal Child (Highschool DxD/DOOM male reader insert)

The Slayer

"Hello brother. How are you this evening?" Rias asked me as Grayfia led her into my office.

"My evening could be going better." I answered as Rias sat down in a chair in front of my desk.

"Well what's the matter?"

I handed Rias a scroll that our Father handed to me this morning. She opened the scroll and began to read.

"As I'm sure you know, even though I am currently ruler of the underworld he still has a very large say in what happens here." I told her.

Rias handed me back the scroll and her face just told me exactly what she was thinking.

"This task you're asking my peerage and I to handle is...intense." Rias said with an intense glare.

"I realise that, but I trust your peerage with this large of a task." I told her.

Rias sighed deeply and tapped her foot on the floor.

"Who is he?" She asked.

"He...is terrifying, a man only spoken about in prophecies. A man who even hell couldn't swallow into it's depths." I told her as I stood up and looked out the large window to the land below me.

"That still doesn't answer my question."

"He is...The Slayer."

*Your POV*

"You won't break me!" The priest told me as I began to squeeze his neck.

I crushed his neck and let go as his body slumped to the floor. Nothing was here to point me in the right direction, a pointless trip. I kicked the nearby door open and began to walk back through the newly gore filled halls of this church. I noticed another priest wasn't quite as dead as he appeared. I walked over to him and rolled him over and he held a cross out in front of him.

"Begone vile being! The demons will have your soul for this!" He yelled at me.

I reached out and grabbed his cross and crushed it in my grip, then I stood up and picked up a nearby large rock. The priests face began to mutate and his eyes glowed red and his voice began to change into shrieks.

"Titan will swallow your soul into the deepest pits of hell!"

I threw the rock onto the demons head and it splattered onto the ground, creating a large red puddle. I turned around and walked out of the church and closed the doors behind me, I took in a deep breath when a red bolt of energy impacted the door next to where my head was. I looked over my shoulder and saw a small group of devils ready for a fight.

*Rias POV*

I couldn't feel any power emanating from him yet brother made sure I didn't let that fool me. I readied another bolt of energy in case he tried anything. But he didn't look dangerous, he was just wearing black combat boots, denim jeans and a long sleeve dark green t-shirt. His hair was down to his shoulders with a dark red streak through it and his physique was toned for someone who looked to be around my age.

"Turn around!" I ordered.

He surprisingly did as I ordered and I could see his eyes. They burned with anger and hatred, as if he had never known peace.

"You know who we are don't you?" I asked him.

He slowly nodded his head as he looked to each of us as if studying us.

"Do you know why we're here?" I asked him.

Like before he nodded his head and looked to us all.

"So you know what is to happen next." I said to him.

He changed his stance to be ready for a fight and immediately I felt his aura change to be one full of raw power, not energy or magical, but as if his entire body was comprised of power.

"Issei, I shall leave this to you. Please be careful." I said to Issei as he stepped forward and summoned his gauntlet.

"I will Rias." He said to me.

"You're brave Issei, trust your training and be strong. You can win."