Summary: What if during the Family Day at the Kuoh Academy? Another relative of Rias Gremory shows and was adoptive into the Gremory Clan for eleven years. Ren Arc-Gremory the Black Devil Berserker and Queen of Serafall Leviathan has been training his body and mind to become stronger for his own goals and overcome any that comes at him. Ren is the Devil that shows honor and battles for what's right in the world of DxD. (OC x Harem) Berserker (Lancelot)-OC. AU [Self-Insert]
AN: This story was inspired by Prince of Destruction by Holy Knights of the Round Table and I don't own anything, but my OC and now enjoy the story.
Preview
A black knight raises up from his kneed down portion, gathering up the demonic magic and mana he need to fight an army. Black smoke comes out of his back and stands tall as he let out demonic roar that all can hear.
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The black knight fights many waves of rouge Devils, Fallen Angels, Angels, and humans with magic abilities. He summoned a minigun, firing many rounds at his foes and killing them within seconds. Blood spills everywhere as the knight kept the kill going.
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The black knight picks up two massive poles in his hands before throwing at the rouge Fallen Angels and killed them by the spinning poles.
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The black knight lugged at group of rouges, swing his massive weapon at them with demonic magic following behind and left no one alive.
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The black knight summons dual rifles and started to fire the clips at the Stray Devils that surround him before firing black demonic magic bullets.
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The black knight punches, kicks, breaks, and destroyed any rouge creatures coming at him while absorbing their blood into his armor for power.
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The black knight swings a holy demonic sword at his foe, destroying them within a strike and left nothing behind.
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The black knight investigates the air to see a fighter jet and jumped onto of it. He used his black metal tendrils to control of the jet. As he took the jet as his own and started to fly it in super speed. Red lines of energy follow behind the jet as the knight fires many missiles at the large group of rouges down below and drove the jet to crash down on top of them. Many explosion and killed many rouges, but only one came out alive and was the black knight himself. He then let a demonic howl in victory with his demonic magic flying around him.