The Death Eaters are characters featured in the Harry Potter series of novels and films. They are a radical group of wizards and witches, led by the dark wizard Lord Voldemort, who seek to purify the wizarding community by eliminating wizards and witches born to non-magical parents. They attempt to create a new order within the Ministry of Magic by spreading fear through the wizarding community and murdering those who speak out against them. Their primary opposition is the Order of the Phoenix.
Death Eaters recognise one another by the Dark Mark, a sigil branded on each of their left forearms that allows Voldemort to summon any of them instantly. Their typical attire includes black hooded robes and masks. The Death Eaters as a group first appeared in the novel Harry Potter and the Goblet of Fire, although individual members of the group, such as Severus Snape, Lucius Malfoy, and Peter Pettigrew had appeared in earlier books in the series. The group had also been mentioned indirectly in Harry Potter and the Philosopher's Stone and in Harry Potter and the Chamber of Secrets, when followers of Voldemort were mentioned. They were mentioned the first time directly in Harry Potter and the Prisoner of Azkaban.
Synopsis
Pre-Harry Potter
The Death Eaters first existed over 11 years before the events of the books, torturing and murdering Muggles (people without magical abilities), as well as anyone who opposed them, including wizards who support Muggles (such as the Weasley family). Around 10 years after the Death Eaters first surfaced, a Seer named Sybill Trelawney made a prophecy about a boy who would have the power to defeat Voldemort forever. The prophecy could have referred to two different boys, Harry Potter or Neville Longbottom; however, Voldemort chose Harry as said in the prophecy, that "the Dark Lord would mark him as his equal". As Voldemort was a half-blood, he chose his "equal", Harry, whose mother was a Muggle-born witch, instead of Neville, who came from a long line of pure-blooded wizards. Acting on information from James and Lily Potter's Secret-Keeper Peter Pettigrew, Voldemort attempted to complete the prophecy and kill his infant rival. Due to Harry's mother's sacrifice to save her son, Voldemort's deadly curse rebounded off Harry and disembodied Voldemort.
With Voldemort vanquished after failing to kill Harry Potter, the Death Eaters largely disbanded and vanished. The Ministry rounded many of them up and imprisoned them in the Wizarding prison Azkaban, but some eluded justice by claiming they were bewitched by the Imperius Curse (it is implied that Lucius Malfoy did so) or by turning in other Death Eaters, as Igor Karkaroff did; Harry witnesses Karkaroff's testimony against former Death Eaters in Albus Dumbledore's Pensieve during the course of the series. It appears that very few Death Eaters stood for their fallen master and proudly went to Azkaban for him (like Bellatrix Lestrange), since, in the sixth book, Snape states that if Voldemort had refused to welcome back all those who turned their backs on him when he fell, then he would have very few followers. The Lestranges are the only Death Eaters known to have willingly sacrificed their freedom for Voldemort. Voldemort takes notice of this and claims that they will be rewarded above all others for their great loyalty. Snape's position as a Death Eater is unique – during the books he convinces all (with the exception of Dumbledore) that he is working for whichever side requires it at that time. This is due to his skill at Occlumency allowing him to disguise his true motive – a love for Lily Potter – from Voldemort.
Re-emergence
Early in Harry Potter and the Goblet of Fire a group of Death Eaters rallied after the Quidditch World Cup. They gathered to form a large spectacle and disturbance which spread instant chaos and fear amongst the wizarding community. Their appearance alone created hysteria, and their numbers grew while they tortured Muggles and Muggle-borns on sight. It concluded when the Dark Mark was produced in the sky by Barty Crouch Jr, frightening Death Eaters and Ministry officials alike. Voldemort, having regained his full strength at the end of Harry Potter and the Goblet of Fire, summoned his followers to him by touching Peter Pettigrew's Dark Mark. Except for Severus Snape (who was staying at Hogwarts to "maintain his cover") and those dead, imprisoned, or afraid to return, the majority returned to his service as Voldemort began his second attempt to claim all power.