The Abyssal Hero of Vengeance

Male Reader x Highschool DxD.
Y/N L/N was another survivor of the Holy Sword Project. He was about to die but then Rias came. He thought that he would be saved by her, but Rias sensed no power in him, so she left him to die but not without insulting him for being weak. After that, he trained and then became the most powerful warrior who was feared by all Supernatural beings. Even the Dragons were scared of him and the most embarrassing thing is that he was just a crossbreed between a normal human and a Fallen Angel. A crossbreed who could easily beat the four Factions at the same time. A crossbreed who was powerful enough to rival Great Red and Ophis. When he meets an old friend again, he saw that he made new friends. One of his friends was the one who left him to die many years ago. How will he react? Who knows.
Dislclaimer: I don't own anything. Just this story.