HP: Arcturus Malfoy

What if a new player appeared in the Harry Potter universe? Arcturus Malfoy is the heir to the ancient and noble Malfoy family. But there is one catch: he is not just an ordinary eleven-year-old boy. The childish sparkle in his eyes has disappeared, giving way to the sharp mind of a man who knows the future of magical Britain. Now he is completely different — a mixture of a pure-blood heir and a man from another world. A dangerous combination of ambition, knowledge, and talent. And he is ready to step over anyone who stands in his way. After all, it's much more fun to play chess than to be a piece on the board. And he has an advantage — so why not use it? Study magic at different schools, explore the vast magical world, and maybe even assemble his own small army. It sounds simple enough. All that remains is to turn his goals into reality. — Description from novelcodex.org