Draco Malfoy, Harry Potter, Ron Weasley, Theodore Nott and Blaise Zabini works together in Ministry. Shacklebolt decided that they are the best team for the new mission because they are the best Aurors he has. New magic tribe was discovered by accident. The few information he gathered about the tribe said that it was dangerous, powerful and completely dominated by women. The mission was about assessing if the tribe was danger for the rest of the wizarding world.