Where is maric and where is the rare hunters that come at night?

In order to find marik, you must look for a crystal with no stars. Normally, these are just annoying people who say something, then leave. However, when I went up to one of these, it was Marik. He introduces himself as Namu. He refuses to duel you and leaves. Keep dueling at night until you are stopped by the Rare Hunter. Beat him, and it will be revealed that he is being brainwashed by Marik. He'll leave, then Yami Yugi will show up and talk to you. Then, a whole new plotline with Marik and his Yami will start.

I don't know about maric but the rare hunters attack you at random at night when they do it's a shadow game if you want to find them go for long distances and they'll attack you like half way to your destination I know cause that always happens to me