Explanation of the Dark Mark and Death Eaters

Back at the tent, Arthur Weasley explains the significance of the Dark Mark to Harry, Ron, and Hermione. He recounts how Lord Voldemort and his Death Eaters used to conjure the Dark Mark after every murder to spread terror. Bill and Ron speculate about the connection between the Death Eaters at the campsite and the appearance of the Dark Mark, while Arthur Weasley expresses concern about the growing tensions.