Does anyone remember that awesome Harry Potter fanfiction that was made after Order of the Pheonix and was named The Half Blood Prince, BUT was totally different from Rowling's Half Blood Prince. I believe there was this hero character called Mars, who taught Harry the Unforgiveable curses. I also remember that Mars was actually an acronym for his full name, his first name being Mordeciah. This fan-fiction came out years ago. I want to find it and re-read it!
In a Harry Potter mood