AN: Crossover b/w Attack on Titan vs High School DxD
AN2: It's a year since the end of Attack on Titan (manga) and that's the last time I read it. There might be some misinformation in this idea.
AN3: slight change in original AOT mentioned in first para.
Title suggestion: The return of terror (The 73rd pillar)
Change in original manga: Ymir gives Eren founding titan powers while adding a condition that he has to fulfill one of her wishes when he dies.
After Eren's death…
Eren Yeager finally found peace after eradicating 80% of the world population, thinking that humans will leave in peace when they find a common goal while being completely underestimating the human greed for power (as indicated in the end of manga the bombing and razed cities). Once again, he meets Ymir Fritz to fulfill his end of bargain. Ymir Fritz tells him about the DxD world from she actually came from. She is actually a devil of from 73rd devil family. She is the last of her kind when the other 72 pillars decided that they were too dangerous to be kept around. They all attacked 73rd pillar (name suggestion: Titans) and tried to eradicate them from the surface of hell, taking huge damage to themselves during the massacre. They were helpless against them because hell doesn't have sun which maximizes their power. She was just a maid in 73rd pillar and when something went wrong with her teleportation spell, she ends up in AOT universe.
She was able to locate the coordinates of her universe after 100 years of death, but her body disintegrated during that time. only having a spiritual body that was bound to AOT universe she wasn't able to return to her home.
She now wants Eren to go to her world and have revenge on the 72 pillars and eradicate every single one of them.
Eren don't want to enter another war, he just wants to rest in peace. But bound by his promise he was left with no other choice.
(now here Eren asks some random questions and information like, how will he beat the devils who were able to defeat the 73rd pillar, what kind of power comes beyond founding titan, how will he revive 73rd pillar, how will he find who are the members of 72 pillars, can he spare good devils, etc)
(ideas of answer, high level powers [your choice], ruins of 73rd pillar, her treasure chest [savings], the 73rd pillar leader's treasury location, etc.)
After getting basic information, Eren finally decides to go on another adventure (killing spree/massacre).
Eren's head disappears from Mikasa's hand just as she was about to bury his head. (I am not about to write her reaction)
(Meanwhile in dxd universe)
Eren's head drops in Sea of Japan and gets drifted towards the beach as his neck slowly starts releasing steam…
Note: Eren is already a devil (no wings). He will form his own peerage using the titan powers, not using the chess piece system.
AN: Thanx for the 2 follows I got.
AN2: please inform me if you decide to pick this up. If you like the idea and want to take some parts from it, please inform me so that I can read your fic.