- Voldemort is mad and sends out some more terrible spells against the castle. His wand doesn't seem to be working properly for him, but it does enough: The castle's protections have broken.
- The Death Eaters rush onto the grounds. Neville, fleeing from them, almost falls to his death on a bridge when it breaks, but he manages to scramble back up to safety. Whew.
- It's total mayhem now, guys. Giants are suddenly rushing the grounds along with the Death Eaters.
- The good guys retreat inside Hogwarts, with the bad guys in pursuit.
- Suddenly, everyone is dueling.
- Harry and Ginny run into each other and make some time for kissyface, but then it's back to work for both of them.
- Harry arrives at a wall. Elsewhere, Ron and Hermione, who are looking at the Marauder's Map, realize he's probably in the Room of Requirement.
- Meanwhile, Draco is trying to lead his buddies in pursuit of Harry. Oh great, just what we need right now. He sees that Harry has entered the Room of Requirement.
- Inside, Harry finds the diadem. He hears all kinds of creepy whispering when he picks it up, which is definitely a sign he's found a Horcrux.
- There's a problem, though: Draco and his friends, Crabbe and Goyle, arrive looking for Draco's wand.
- Harry asks Draco why he didn't give Harry up to Bellatrix (at the end of the last movie). Draco doesn't answer, and his buddies tell him to finish Harry off.
- Luckily, Ron and Hermione arrive, and Ron chases Draco and friends off.
- Hermione and Harry go after the crown, which had been knocked onto a huge pile of other stuff.
- Ron then comes running back, screaming. Crabbe has unleashed this crazy snake-monster thing made of Fiendfyre. It's like regular fire, but it's super hot and acts like a heat-seeking missile and is almost impossible to control or put out. And yes, it's as freaky as it sounds.
- Suddenly, all the kids are on the run from the Fiendfyre, which they have no power to stop.
- Ron, Harry, and Hermione get broomsticks to stay above the fire, but Harry refuses to leave Malfoy and Goyle (Crabbe…yeah, well, you can guess what the Fiendfyre snake did to him).
- They manage to get them out of the room safely.
- Draco takes off, and Harry and friends destroy the Horcrux just outside the room.
- Voldemort feels it happen. He's getting weaker, guys…