Snape asks what they're doing here, along with the mass of students behind her, and Bloom clears her throat and says "We're ending this here and now, Snape!"
Snape whirls around to see Bloom standing there in her new outfit, which she's read is called Believix, and stares at her with his mouth hanging open in shock.
The rest of the students who didn't know about her are staring as well, and more than a few of them faint.
"What? Now it's a different story when you can't pick on a kid in class? You've hated me since the day I came here, why don't you try to put an end to me? I've already beaten the Carrows, and you know as well as anyone that a curse won't work on me - not the Imperious Curse, at any rate."
The fires in the torches are dancing higher and higher, and then the leap out and form a ring of fire around Bloom and Snape. "Look familiar Snape? Like the night you killed Dumbledore and set Hagrid's hut on fire?"
Crabbe calls out "You don't even have your wand! How're you going to win this duel?"
Bloom smirks, and snaps her fingers - summoning her dragon-carved wand for everyone to see. "You mean this wand? The wand I made out of my own powers? The wand I only needed to blend in at this school?"
Bloom suddenly points it at Snape, and he barely manages to block her wordless spell - he does get pushed back a few feet though.
Bloom doesn't hold back on anything, controlling the fire and using it fully and using both her wand and her fairy powers on Snape.
All the students stare in shock and awe as Bloom duels the current Headmaster of Hogwarts and matches him easily in power.
Harry slides his Invisibility cloak off and watches, and Professor McGonagall notices. "Potter, I'd say you got the best protector Faragonda could send."
Filius Flitwick, Pomona Sprout, and a wheezing Horace Slughorn come running into the room, only to stop and stare at the sight of Bloom.
Slughorn asks "Is that Bloom?"
Harry nods, and he asks "The Potions Queen last year?"
Harry nods again, and Flitwick asks "With wings? Up in the air and shooting rays of magic from her hands?"
Ron, Harry, and Hermione nod, and they all break out in grins. Soon, the teachers do as well when they get the implications for the near battle.
Filius spells a suit of armor, and it attacks Snape as well - he tries to send it at Bloom, she stops it mid-air and sends it back twice as fast and the pieces embed themselves in the wall.
Snape's outnumbered and far outmatched, so he runs into a deserted classroom and jumps out a window.
They all look out at the sound of a crash, moments after Bloom flew in, and hear her scream "COWARD!" The window's broken, and Snape is flying away as a jet of black smoke.
Harry asks Professor Flitwick about Rowena Ravenclaw's diadem, but he learns it hasn't been seen in living memory.
Meanwhile, Professor McGonagall is summoning more suits of armor to help defend Hogwarts - and everyone is staring in shock at Bloom.
Protection Charms are being cast, and the school is being fortified - but it won't last forever.
Harry and Bloom get back to the Room of Requirement, and find that even more people are there - including Sirius, Remus, and the remaining Order of the Phoenix members.
Bloom and Harry hug Sirius, then Remus - who are both staring at Bloom in shock.
She smacks her hand to her face, the hand without her wand, and says "Really? You two also? It's a new transformation, not a new personality."
Harry grins, and says "Riddle won't stand a chance."
The two men grin at that, and Sirius smacks Harry on the back saying "Harry, you're just like your father. Courage and talent, through and through." Remus adds "And Bloom's like Lily, except with wings."
Ginny and her mother are arguing, but Molly agrees to let Ginny stay at the school if she stays in the Room of Requirement.
Professor McGonagall announces that the students who don't want to fight will be evacuated through the passage to the Hog's Head Inn, and everyone else will go to the Great Hall.
Percy Weasley arrives, and immediately apologizes to his family for not supporting them - turns out they were right about everything. They immediately forgive him, and so does Bloom after he does the same for her.
They suddenly hear Voldemort's voice ring through the entire school, as he says "I know that you are preparing to fight. Your efforts are futile. You cannot fight me. I do not want to kill you. I have great respect for the teachers of Hogwarts. I do not want to spill magical blood. Give me Harry Potter, and they shall not be harmed. Give me Harry Potter and I shall leave the school untouched. Give me Harry Potter and you will be rewarded. You have until midnight."
Pansy Parkinson spots Harry, and yells "There he is! Somebody grab him!" She gets hit with a blast of orange magic before anybody can react, and goes flying onto her back in a smoking heap.
Bloom lets out an ear-piercing whistle to get everybody's attention, and yells "Anybody wants Harry, they have to go through me to get him! Any volunteers?"
She looks around, and finds all of Gryffindor standing with their wands ready, right along with Ravenclaw and Hufflepuff - and they're looking at the Slytherin kids.
Professor McGonagall announces that all of Slytherin house will be evacuated, along with anyone underage or who doesn't want to fight.
All of Slytherin house leaves, but half of Gryffindor stays, along with a third of Ravenclaw and Hufflepuff.
Bloom and Harry have to go find Ravenclaw's Diadem, so Bloom uses a tracking spell - it doesn't work, making Bloom break out in a grin.
Harry asks "What? You know where it is?"
"Harry, where's the one room that could keep someone from tracking an object?"
Harry grins as well, and they run back to the Room of Requirement.
They find Hermione and Ron there, and Ron mimicked the Parseltongue Harry used to open Salazar Slytherin's locket before they went to Hogsmeade.
Ron used Godric Gryffindor's sword to destroy the locket, the blade having been infused with Basilisk venom when Harry used it to kill the monster. They destroyed Helga Hufflepuff's cup with a fang from the basilisk, and have gotten many more for any future Horcruxes they find.
Ginny, Tonks, and Mrs. Longbottom are in there, and Bloom says "We need to change the Room! Mrs. Longbottom, last I saw, Neville was going to lead the defense with some of the Professors."
The older woman beams, and says "Well then, I think I should go help my nephew! If he's going to battle Death-Eaters like his parents, I'm going to be there to see it and be proud!" Tonks grins, right along with Ginny, and they all leave so the Room can change.
Ron says they should go warn the House Elves working at Hogwarts, and Hermione kisses him - she's been waiting a long time to do that.
Bloom smirks, then they go back into the Room of Requirement again.
The room is full of junk, and the four split up to find the Diadem. Bloom finds it, but they get cornered by Draco, Crabbe, and Goyle.
All three stare at Bloom for an instant, their mouths hanging open, until she floats them up like she invisibly did in year three at Hogsmeade and blasts them.
A duel breaks out, and Crabbe unleashes the Fiendfyre curse.
He can't control it though, and it quickly rages out of control. Ron and Hermione run for their lives, and Harry and Bloom see Draco with his still friends. Bloom pulls him up roughly by the robe, and says "Go! Harry, get him out of here! I'll stop the fire!"
Draco asks "How? You can't control this!"
"Wanna bet, Malfoy? There's loads of things I can do that you can't even dream of."
She pushes him into Harry, then flies directly into the fire and throws the Diadem out of it and into Harry's hands. Goyle and Crabbe go flying out of the fire as well, and they can hear Bloom chanting a spell of her fairy powers.
Harry says "Move it, Draco! Grab one of them, I'll grab the other."
As they run and drag the two boys, Draco yells "Bloody hell Potter! Is there anything your girlfriend can't do?"
"Be evil? Work with Voldemort?"
Harry glares at Draco at that, and he says "I didn't have a choice! The Dark Lord would have killed me and my family!"
"And you never thought that the girl who fought him and lived couldn't do anything?"
"Dumbledore said that…"
"We heard. We were on the floor below. Why did you think Bloom was so angry? How she knew?" Draco pales, and then they hear a massive roar come from the room.
Crabbe is more or less fine, he just got caught in the smoke - Goyle got knocked unconscious, but now he groans and moves his head to the side.
Draco immediately kneels down beside him and says "Goyle, wake up! I mean it, wake up already!"
"Ugh, Draco…do I remember the mystery girl being back and wearing a skirt and wings?"
Draco laughs near-hysterically, and says "Yes, yes you do. She saved you, threw you out of the flames. Crabbe to. She's still in the room, with the Fiendfyre."
The Diadem in Harry's hands suddenly gives out a shriek, and then crumbles. Hermione remarks "Fiendfyre is one of the only things that can destroy Horcruxes - but it's so deadly that I'd never have dreamed of using it!"
Ron looks in the Room, and sees the fire is dying down. "Oh, looks like Bloom is better though. Fire's gone."
Crabbe is awake now, and his jaw drops.
Bloom walks out, covered in soot and smelling like smoke, and asks "Alright, which of you two started that?" Crabbe raises his hand meekly, and she decks him.
"Next time you decide to try a curse, make sure it's one you can control. Horcrux gone?" Harry nods, and she suddenly claps her hand to her head. "Great, they've gotten in. Let's go, guys!"
She takes off at a running start, and Harry, Ron, and Hermione run to keep up with her.
Crabbe asks "Who've we been going to classes with all this time?"
He and Goyle look at Draco, and he says "A fairy from another universe - one who happens to be all-powerful, apparently. I wouldn't get on her bad side anymore, guys."
They all nod, then start making their way back to the sounds of spells being cast and explosions.
Crabbe is muttering "She can fly. She's got wings, and she can fly..." He doesn't even want to think about the blasts from her hands, the two boys are pretty much in total shock at the moment.
AN: Yeah, Bloom won the duel with Snape easily - being the strongest student in a school of magic-users means you can do this stuff. Big fight coming up, guess how many Death-Eaters are going to be piles of ashes!