Harry and the gang had successfully retrieved the diadem which was actually in the Room of Requirement where Harry last hid the Halfblood Prince's book. However, like all other fantasy stories, their quest was met with obstacles: Draco Malfoy, Gregory Goyle, and Vincent Crabbe.
The three Slytherins followed the group into the room and challenged them to give up the diadem. There was a wand battle involved between the two groups. The duel was in favor of Harry's group as he managed to disarm Draco. Then out of nowhere, Goyle decided to cast Fiendfyre towards Ron who dodged the cursed fire where it landed on a bookshelf. Seeing as Fiendfyre was cursed and needed a powerful wizard or witch to be able to control it, suffice to say, the Room burst into flames. Goyle died as he was c
