A Death Eater mask is a mask worn by a group of fictional characters known as the Death Eaters. These characters appear in the "Harry Potter" book series by J.K. Rowling.
In the "Harry Potter" series, Death Eaters are led by the dark wizard Lord Voldemort. Their typical attire consists of long, black, flowing robes and black masks with hoods. The Death Eaters are first revealed in the book "Harry Potter and the Goblet of Fire," but Death Eaters appear earlier in the series, as it is revealed that some significant characters who have appeared in previous books are Death Eaters.