High Human in Crossed Worlds - A HP x DxD Fic HHCW

Man dies. His last act in the previous life generates him an absurd amount of karma. He meets a god, and it reborns him in a crossworld of Harry Potter and DxD. He gets a gift, one that can only be fully explored with the knowledge that he learned in his previous profession in the previous world. The keeping of knowledge is also a gift. And with that, his karma is spent.
Thrown in the world with a 'good luck' and a slap in the back, he fights to survive until the start of canons.
The time until that, 1000 years.
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Yeah… Now read about some of his adventures in this crossed over world, beginning already in HP canon.
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English is not my main language, so you will find some strange stuff, like the mix of North American and the Queen’s English.
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Disclaimer: All characters that you recognize from the franchise of Harry Potter and DxD are propriety of its respective creators and I only wish that they were mine. But they are not. I only own the MC, the OCs, and the ideas that generated the non canon plot.