Now for the idea behind this i got diablo 3 recently played through the game as the necromancer personally if i do this book idea the readers get to choose which nephalem they are from the classes that exist in the game but personally for me the one i know the most about is the necromancer and witch doctor so yea.

But basically i do have a little story behind this one and unlike most of my old stories your awakening isn't caused by rias. Its her brother.

He woke you up a champion from ancient times and begged you a nephalem slaughter of demon and hel spawn to break up the marriage obvously not used to this new world and place you from your own era you decline his asking and try to kill him as you have azmodan and diablo before him as you see demons as your enemies thus he retreats leaving you t explore the new earth.

I even have a second book idea as well a spin off to this one but its not a reader insert im calling it if i do make it.

"A Angel From Another World"

Tyrael arrives in the world of dxd he arch angel of justice himself a powerful fighter and this is pre human Tyrael. So hes still a angel.

But thats what i got for ideas for now anyways.