Dumbledore's Army
The six enter the Department of Mysteries where they uncover a bottled prophecy, the object Voldemort was after. However, they are ambushed by Death Eaters including Lucius Malfoy and Bellatrix Lestrange. Lucius reveals that Harry only saw a dream of Sirius being tortured; it was simply a ruse to lure Harry into the Death Eaters' grasp. Harry refuses to give Lucius the prophecy, and a fight between Dumbledore's Army and the Death Eaters ensues. The Death Eaters take everyone except Harry as hostages, threatening to kill them unless he surrenders the prophecy.