A Girl's Reincarnation in DxD

A nameless soul got reincarnated in the world of DxD with some cheats and magical knowledge. This is the story of a girl breezing through the world of DxD with her Authority and Magic! English isn't my main language so expect some grammatical errors in this fic. Also this is my first time writing a novel so please guide me~ Disclaimer: I only own my OC's, the rest belongs to their respective owner/author.