Flashback.

"Today, we'll be discussing one of the most dangerous Grimm's around on Remnant. The Reaper." said Professor Port of Grimm studies.
The entire class suddenly woke up, as the word 'Reaper' was spoken.
"In all of Remnant's history, there is no creature of Grimm more dangerous that the Reaper. This Grimm takes the form of a dragon like appearance. It's most prominent feature is the size of it. While not as high as a Goliath, the Reaper is by fat the longest Grimm around. From head to tail, an adult Reaper's size is around three hundred feet, or one hundred meters. It's wingspan, from tip of the wing to tip of the other wing is four hundred and fifty feet, or roughly one hundred and forty meters wide. It's black hide is almost completely covered by armor plating, making it very hard to kill."

The class was listening, and taking notes of this Grimm type.
"It is said that every seventy years, a reaper appeared somewhere on Remnant and unleashes hell and fury upon one of the four kingdoms. Most of these attacks come from the Reapers smoke, that solidifies and creates several Grimm. Most commonly is the Beowulf and the Boarbatusks, but it can also create Ursa and Creeps." Said professor Port as he observed his students. It was a very different lesson for them, as it usually involved Port telling them about his hunts with some sort of unconventional weapon, like a fish, or something equally useless to fighting Grimm. Now he was telling about the powers and weaknesses of a Grimm.

"There are very few huntsmen and huntresses that can kill a Grim this size. A deathstalker and Nevermore can usually be finished of in a team of four. Goliath's and other larger Grimm, a team of eight or more. But Reapers?"
Port let out a sigh. "Reapers can only be killed when you have a large enough team. At least eighty huntsmen and huntresses are needed. And even then, most Huntresses and Huntsmen will be killed before the Reaper is down."

Flashback Ends.

Ruby Rose had learned all that is the last year. She was a third year huntress at that time and while accepting missions with her team, she still had to attend classes at Beacon Academy.
Now she was part of the delegation of Beacon Academy that supported one of their own. Harry Ozpin, adopted son of the headmaster, Professor Ozpin, had been forced to enter into the Triwizard Tournament. She had sat with her team and her sister teams in the stands and watched with joy as each and every Champion collected an golden egg from a nesting dragon. While she was younger than the rest of her team, Ruby had matured a lot. She was still happy and smiled a lot, but her time in the field had shown her the true horrors of fighting Grimm. More than once, did she see people die in front of her, while they were fighting Grimm. So, when she saw the Reaper landing, She gave one order to her team. "EVACUATE"

Her team reacted as they had planned. Yang, Blake and Weiss all jumped up and started to warn students that they needed to get to safety. While teams JNPR, RAVN, SSSN and CFVY did nodded and started to spread out, most of the wizarding students just kept their seats, until the Reaper waved it's tail, destroying a part of the stands. That sent most of the wizarding students in a panic and started to run everywhere.
"Oh no" Ruby said as she spotted Harry Ozpin in the arena, facing the Reaper. "Weiss, get him out of there." She yelled as Yang activated her shotgun gauntlets, and started to fire at the reaper, trying to distract it. "Harry" Weiss shouted as she created a Glyph near Harry's feet. Harry jumped on it and flew right to the stands, next to Weiss. "Thanks Weiss. I owe you one" Harry said as he pointed to the Reaper. "What's the plan?"

"We get all the students to the castle, while we try to find out how to kill this thing" Blake said as she came back from collecting their weapons. Handing over Crescent Rose to Ruby and Myrtenarster to Weiss, while holding Gambon Shroud on her back. "You girls, get the royal prince back to the castle" Shouted Vixen Jones as she pulled out her sword and pressed a button to fold the sword out in 160 degrees, creating her bow. Taking out an arrow from her quiver, Vixen jumped on one of the many now empty stands and fired her arrow at the reaper. The arrow flew towards the Reaper and at contact exploded, covering the Grimm's face in smoke.
"GO" Vixen shouted as she placed another arrow on her bow.
Harry nodded and started to move with team RWBY to the exit. Before they reached it however, the Reaper started to spew out smoke, that seemed to solidify in several shapes, creating a dozen Beowolves.
"Run" Harry shouted as he began to run towards the waiting students. "To Hogwarts, all of you"

Outside the stadium, Hogwarts students were running around, finding their friends, house mates and family. They didn't hear the orders from their heads of houses. Several professors raised their wands and fired a mild cannon blast to get the attention of the students.
"Now that we have your attention." Said Dumbledore as he looked at the faces of his students. "All students will go in a controlled manner to the Great Hall, where you will remain until further notice. Those who refuse to do so, will be punished by the Hogwarts laws accordingly."
What ever Dumbledore's wanted to say was drowned out by the destruction of one of the stands, causing three dozen Beowolves, couple of Ursa and a whole swarm of Boarbatusks to exit the stadium.
"Get to Hogwarts. We'll hold them off." A voice said as team RWBY and Harry appeared in front of them. Teams JNPR and SSSN nodded and motioned to the students to follow them to Hogwarts, while team CFVY stood with team RWBY to hold the line.
"Mr. Ozpin, get inside." Dumbledore ordered as Harry shot a Beowulf through the head. "Not now, sir." Harry said as he fired again, causing another Beowulf to lose it's life. "Reducto" Dumbledore said as a large pack of Beowolves exploded, creating a large hole in the lines of the Grimm.

"Old man, get back inside. Let the professionals handle this" Said a voice as a jeep like car appeared behind Dumbledore. Looking at the inhabitants of the car, Dumbledore saw Ray Star pointing the car's machine gun at the Grimm, firing Dust bullets at them. "How?" Dumbledore asked, pointing at the car. Both Nova Heart and Angel Star were in the drivers seat and passengers seat, respectively.
"That doesn't matter. Get inside."

"Alright teams, when every wizarding student is safe, slowly fall back to the castle. That includes you, Harry." Said Ray as he fired more rounds in the ever attacking Grimm. Dumbledore could only watch from a distance, as more and more Grimm came from the stadium. Suddenly, he saw a small explosion that threw someone out of the stadium, and near the forbidden forest.
"Shit, VIXEN" Ray shouted as he looked at the drivers seat. "NOVA, get us to Vixen" Ray shouted. Nova nodded and pushed her feet on the gas, causing the car to move forward with high speed.
"Angel." Ray shouted as his cousin jumped out of the car. "Go" She shouted as she activated her gauntlet. From light, it created a sword that she used to cut down several Grimm that were coming towards them, before she transformed the sword into a heave handgun, witch she used to kill an Ursa that was about to hit Harry.
"Watch it kid" Angel shouted as she jumped into the defending line, helping the teams killing the Grimm.

Nova Heart and Ray Star raced towards where Vixen Jones had landed, and found her soon enough. She was bleeding from several wounds, but it didn't looked as bad as they thought.
"Bring her in" Ray shouted over the sound of the machine gun that he was pointing at the Grimm that were coming out of the stadium.
"Come on." Ray shouted as Nova struggled with carrying Vixen. The Grimm were almost on top of them, despite Ray's continuous attack with the machine gun. Suddenly, a new rain of dust bullets came from above the car, and as Ray looked up, he saw a Drop-ship hovering over them. It's machine guns still throwing bullets at the Grimm.
"Well, I'll be damned." Ray said softly as he looked who was flying the Drop-ship. Red hair, freckles on his face, blue eyes and a large smile.
"I can't believe that he's allowed to pilot one of those things." Ray said as he waved to the Drop-ship, that lowered it's bay-doors, allowing Nora Valkyrie, Pyrrha Arc-Nikos and Lie Ren to open fire at the Grimm, allowing for Jaune Arc to jump down and help Nova Heart to place Vixen back in the passenger seat of the car. "Go." Jaune said as he jumped up twenty feet in the air, and was caught by Pyrrha, who pulled him back inside. The car and drop-ship moved towards the group of huntresses and huntsmen who slowly were falling back.

Harry Ozpin sliced through one of the Beowolves neck, causing it to lose it's life, before he cut through another. While the constant stream of Grimm was slowly diminishing, they were losing energy to continue fighting.
" Harry." He heard Hermione shouting, and looked back as she, Ginny and Dora came running towards them. Following them were Glynda Goodwitch and a couple of the teachers.
"What are you doing here?" Harry asked as he fell back, allowing him some rest. "We're here to help you" said Ginny as she fired Hell's Date at the Grimm. Goodwitch waved her riding crop, glowed purple and shot out several spells that fell in a area where the Grimm seemed to move to, killing dozens in one stroke.
"That's cheating." Harry said as he smiled at his aunt. "Maybe, but it does help you." Goodwitch said back as she created a thunderstorm above the Grimm infested Stadium, raining down on top of the Reaper injuring it slightly.
The Drop-ship and car with Team JNPR and RVN of team RAVN came back to them, causing the Grimm to attack again.
Before they could prepare a counter attack, several dust spells flew over them and detonated when they came in contact with the Grimm. Some looked back, including Weiss Schnee. "Winter."

Winter Schnee stood there, her sword and estoc ready to attack, while she loaded her semblance again. Behind her, a new figure appeared, easy recognizable because of his scythe. Wielding it with the grace of a ballerina, Qrow Branwen jumped right in the attacking Grimm line, causing massive destruction on the side of the Grimm.
Just as a Ursa was about to jump upon Angel Star, the Grimm was cut in half by a figure, who wore a mask that looked like the face-mask of a Nevermore. Her sword, a single red bladed weapon sliced through the Grimm, creating enough breathing room for the exhaust huntresses and huntsmen in training. Her black hair, looking like black feathers, flowed through every movement she made.
Having been giving an energy restoration draught, Harry felt the energy coming back to him.
"Come on. Let's finish this." Folding Child's Play into his Guan Dao form, Harry moved forward, followed by the rest of his team, who were followed by teams RWBY, CFVY and JNPR. Keeping sure that Vixen was in capable hands, Ray and Angel Star joined the fight, while Nova Heart used her Dust enhanced gloves to cause death and destruction within the Grimm population.
With so many huntresses and huntsmen in training and a quartet of experienced Huntsmen and huntresses, the battle was all to soon won. The only Grimm that stayed alive was the Reaper.

Said Reaper knew this. It knew that it's Grimm that it had created were gone. The huntsmen and Huntresses had seen to that. From it's point of view, it could see the building where most humans had taken refuge. Spreading it's mighty wings, the Grimm jumped up from the ruined stadium and flew over the hunters towards the castle of Hogwarts.
"NO" Dumbledore shouted as he saw where the creature was heading to. With all it's power that he had, Dumbledore shot exploding curses at the large Grimm, who did felt the curses hitting it's scales. Some even broke, showing a black undercoat of skin, with a black substance falling from it. Dumbledore had wounded the Grimm, but it wasn't enough to stop it from attacking Hogwarts. The Drop-ship that had been hovering above the teachers of Hogwarts suddenly flew towards the Grimm, it's machine guns spinning rapidly to damage it. One of the wings hit one of the engines, causing the ship to lose altitude.
'Come on, Jump' Harry though as he looked at the drop-ship that fell from the sky. Harry now understood the plan. The pilot of the drop-ship was trying to collide his ship with the Reaper. By going as fast as possible, the engines would almost overload, creating a large explosion to damage the Reaper, but probably at the cost of the pilot's life. "NO" Harry shouted as the Drop-ship collided with the Reaper.

An explosion covered the Grimm in a large amount of smoke and debris, while a lone figure shot out from what was the Drop-ship. It seemed to point it's arm to Hogwarts and from it's arm a light extended and solidified into a rope, causing the figure to swing from his position onto the roof of the great hall, where all students were gathering.
"And that's how he should do it" Said Qrow, as he looked at the figure.
"Uncle Qrow" Ruby called as she hugged her uncle. "Is that your new 'prized student?" she asked as she pointed to the figure that stood on the roof of the great hall.
"Yep" Qrow said as he popped the P. "That's one of the few who know how to operate that weapon. Ron might not be the best student, but he sure knows how to kick some ass."
"Ron?" McGonagall asked. "Do you mean Ronald Weasley?"
Qrow looked at the aging deputy headmistress of Hogwarts and nodded. "Yep" Again popping the P. "Ron's been at Signal for a few years now, and while he still needs some therapy, it seems that he was born to be a great huntsmen."

Qrow's look fell from Ron, still on the great hall, to the Reaper who was still flying around. "Now we need to find a way to kill that thing, before it tears down the school. Any Ideas?"
"Well, it's armor is somewhat busted, if we can get something in there, it might buy us enough time to come up with a plan of attack." Said Harry as he looked at the Reaper. "No, the Reaper's armor can regenerate." said Ray as he jumped back into the car, behind the machine gun. "We need to destroy it now, before it enters a state of sleep."
The adult hunters nodded.
"Ray is right. We need to kill it. Now." said the masked fighter who removed her mask, showing that she looked just like Yang.
"Who? What are you?" Asked McGonagall as she looked between the black haired woman and the blond haired Yang. "She's my mother." Yang said as her eyes turned red. "Killing deadly Grimm now, Family reunions later." Qrow said as he looked at his sister, telling her that she'd better be around after the Grimm was dead. Raven Branwen looked at her brother with a look. 'We'll see' she seemed to be sending to him.

Team SSSN was working hard with Ron Weasley to distract the Grimm. It might not be able to produce more Grimm, but it was still a danger for the castle and inhabitants. "Take that" Ron shouted as his gauntlet let out light and shaped into a rifle, that he used to fire upon the Grimm's busted chest. The only effects were a few small cracks on it's chest, nothing enough to really push through.
"SUN, move it" Neptune shouted, as the Grimm swiped one of it's claws at Sun Wukong. The monkey Faunus was barely able to avoid the claws, causing Sun to lose his shirt. Shirtless, Sun pulled out Ruyi Bang and Jingu Bang and started to fire at one spot on the Grimm's chest. More small pieces of it's armor fell down on the floor beneath them. Neptune joined his team leader as they both shot at the damaged underside of the Grimm.
"We got back-up" Shouted Sage as he pointed with his great sword to the advancing Huntsmen and Huntresses. The Machine gun in the car of team RAVN fired rounds everywhere, causing the Grimm to focus on the small car, instead of the school with students in it. Team RAVN drove away, trying to get the Grimm to follow it. Luckily, it worked and RAVN was leading the Grimm on a chase, while the rest of the Huntresses and huntsmen used the Glyphs of Winter and Weiss to jump on the Great Hall, or used their own power to do so. Qrow, Goodwitch, Raven all jumped up the great hall, without any help from the others.

"Ready." Harry called as the Grimm was coming back, still following the car with RAVN in it. "Ron" Qrow called. Give us an aim for a target." Ron nodded and switched form his rifle to a large laser light, bright enough for the others to see where they had to aim.
"Aim" Harry called out, just as Vixen Jones jumped up on the roof, healed from her earlier wounds. Looking at the Grimm that as coming closer, she pulled out a arrow with red dust attached to it. She placed the arrow on her bow and pulled back. "Fire" Harry shouted as spells, shotgun shells, bullets and arrows were fired at the Grimm. All spells, bullets, arrows and shotgun shells flew through the air, combined with several spells from the teachers of Hogwarts and the machine gun from the car of Team RAVN, caused enough damage to tear apart a piece of armor, two by two meters to fall down. "Ron, aim at that section" Harry shouted. Ron nodded and started to aim again the Grimm, but it's tail hit a piece of the castle's tower, forcing Ron to dive away from the debris. Ron had to switch from a laser light to his rope, to prevent him from falling into the great hall. One of the pieces of the tower had created a hole in the roof of the great hall, and Ron had fallen into the hole. Now he was holding on, as all the students, Hogwarts own and guests looked at him. "Qrow. I need some help here" Ron shouted.

"Vixen, target that thing and sent me to it." Harry said as he walked quickly to Vixen Jones.
"What?" Vixen asked, not knowing what Harry was saying.
"Vixen, use the arrow with a rope, attach me to the rope and shoot me to the Grimm." Harry said as the Grimm circled around once more. Looking at the others, Vixen could see that while they didn't want Harry to do it, it was the only choice.
"Very well. Hope you know what you're doing." Vixen said as she switched from dust-infused arrows to a arrow with a piece of rope attached to it.
"Professor, make two large columns, preferably out of a strong steel. Team RWBY. I need to use the slingshot" Harry said, first to Professor McGonagall and second to team RWBY.
"Winter, when we've been shot, I need you to return Vixen to this place." Harry said, smiling slightly at the Atlesian Specialist. Taking Piercing Jack from Ginny, he attached it to his own belt.

While Harry was talking about his plan to have him and Vixen being slingshot towards the Grimm, team JNPR was working on keeping the Grimm from attacking the great hall. Nora was firing her grenade launcher, while Pyrrha and Ren were firing bullets. Finally, it was time to launch the slingshot, as both Harry and Vixen were seated on a Glyph that Weiss had created, that would propel them towards the Grimm flying over them. To help them with the speed, Gambon Schroud was placed between the two pillars that McGonagall created, stretched to it's maximum.
"Ready." Weiss called as the Grimm flew towards them again.
"Aim." Weiss controlled her voice, and the Glyph that she would use to propel both Harry and Vixen to the open wound on the Grimm's chest.

"Fire." With one elegant swipe with her rapier, Weiss unleashed the Glyph's energy, shooting Harry and Vixen towards the Grimm. In mid-flight Vixen pulled an arrow from her quiver, with a rope attached, she aimed at the Grimm, and fired.
The arrow hit on the underside of the wing-joint, but the effect was the same, Harry was swept from beside her and held on to the rope for dear life, as he tried to climb to the wound, where he would be able to harm the Grimm. Vixen saw several Glyphs appearing and jumped on each of them, sending her back to the roof of the great hall. Now Harry had to fight the Grimm in midair.
While he knew he was a good flier, he preferred a broom instead of the erratic movements of the Grimm. With a twist in midair, Harry fell on top of the Grimm, the rope falling from his grasp. "NO" Harry shouted as his only means to kill the Grimm fell from his hands. Taking Child's Play from his back, Harry carefully made his way to the hear of the flying Grimm. Seeing a small wound between the shoulder blades of the Grimm, Harry got an idea, and slashed Piercing jack into the wound, causing the Grimm to roar out loud. Taking out three of his four Dust crystals that he held in Child's Play, Harry charged them with his aura, making sure to position the crystals so, that when one would explode, it would cause the other two to explode as well. Activating his aura, Harry charged the fire Dust Crystal, followed by the Ice crystal and Lightning crystal.

Seeing the fire Dust crystal blinking softly, Harry nodded and took Piercing Jack from the wound, before moving away as far as possible. Harry smiled as the Grimm passed over the school once more.
"No" Harry said as the crystals started to blink quicker than he had thought. If they exploded over Hogwarts, it could destroy the entire castle. Throwing Piercing Jack out to one of the wings, Harry pulled hard on it, causing the Grimm to change it's path. Instead of moving over the castle like it intended, it now flew over the black lake. Harry smiled, but his smiled was short as he suddenly felt a burning heat coming towards him. While he was able to jump away from most of the explosion of the fire Dust crystal, he wasn't able to escape completely from it. Harry felt the flames licking his face and right arm, before he jumped of the Grimm. Harry felt the wind passing him as the Grimm exploded, severing it's head and neck from it's shoulders, it landed in the black lake. Harry hoped on a slightly softer landing that he had given the Grimm he had just killed. Seeing the ground coming closer and closer, Harry prepared to land and roll out his speed, hoping to minimize his injuries.
"Harry" A voice called him as a chain was thrown at him. Grabbing the chain, Harry felt himself being jerked up, before realizing he was hanging on a chain, that came out of a Drop-ship that had flown over him. Pulling himself up with his last strength, Harry entered through the bay-doors, and collapsed on the floor, barely hearing his name being called.
"Well done Harry. You did well." A familiar voice said as Harry fell unconscious.