In 'Harry Potter Lord of Darkness' fanfiction, the key elements usually revolve around the concept of the Lord of Darkness itself. It might be an ancient and powerful entity. The fanfiction could explore how this being affects the magical world's politics and society. There could be a lot of mystery and intrigue as characters try to uncover the true nature of this dark lord. Also, the way magic is used for dark purposes rather than just for good, like in the original books, is a major aspect. For instance, curses and hexes might be used in more creative and devious ways.
The key elements often include a darker take on the well - known settings. Like Hogwarts might be shown with more hidden and dangerous areas. The power struggle between the forces of good and the 'Lord of Darkness' is also important. In fanfiction, it could be that some of the characters we thought were good are actually being influenced by the dark lord. And new alliances are formed, which is really interesting to see how they play out.