It was the battle between Cinder Fall and Pyrrha, Cinder wanted to be the 'Fall Maiden' so she could bring up one of the evilest beings in all of Remnant. Pyrrha wanted to stop her, so they were going at it. As they were, someone had come upon the fight, he was dressed in black and gold armor and had wings coming from his back.
'I got to get to her before it's too late.' He thought, he came up to the fight. 'Perfect timing 'King boy', I hope it doesn't come down to me having to wait until she dies.' But, of course, the king's luck runs true.
"Yes! Now You Die Maiden!" Said Cinder, with that Pyrrha, was hit and died.
"NO!" Screamed a voice, she looked over and saw him.
"Yer Are Too Late Hero!" She said that was when the hero smirked and pulled out a queen chess piece. "And what's an artifact going te do te stop me?"
"This isn't an ordinary artifact, this is an evil piece." He went over to Pyrrha and placed it on her chest. "And thanks to you. You just gave me my queen," Just then he held out his hand, "PAWNS!" Just then beings dressed in armor appeared. "Protect Your King And Queen!" They nodded and went to attack Cinder, "when you get to where you are, you have my permission to promote yourselves into what you see fit."
"You Think Dey Will Stop Me?" Said Cinder.
"Trust me, they can and will. Now, if you don't mind." He turns back to Pyrrha and hovered his hands over her body, "I, Jaune Alexander Arc, head of the Alexandria clan of the 72 clans command you Pyrrha Nikos to rise and become my queen, serve me to the best of your abilities, til the end of time." The piece had gone into Pyrrha and she started to glow. 'She'll wake rather I'm here or not. Time to teach this bitch some manners!' He stood up and called out his 'Equalizer'. It was a metallic scepter about the size of a baseball bat, he headed over to her as the pawns were attacking ruthlessly. Just then he whistled and they moved as he was in mid-air and slammed the staff into Cinder's head, crushing it. "Just like a teacher's strike; No class." Just then he heard something.
"Ugh," it was Pyrrha. Jaune dismissed the pawns and went to her.
"Are you alright?" She looked up at the voice and saw a man in armor.
"Who are you?" She said he took off his helmet and she gasped, his hair was slightly longer, he now had a goatee but it was still him. "Jaune?"
"Yeah," he said as he scratched the back of his head. "This is what I really look like, I think I owe you an explanation."
"I agree," she said. So he explained the reason why he was sealed was because he was a Devil. He explained that there was a difference between Devils and Grimm. Grimm was the personification of hate, whereas devils were still human.
"My powers were sealed so that I wouldn't hurt anyone."
"And the transcripts?"
"Would you be accepted into a school for hunters if they were to know that you were a Devil King?" His wings started to come out of his back. They were bat-like and had a 20-foot wingspan. She was amazed, "I can do what they said, it's just I'm a devil."
"So what now?"
"Well, I'm going to have to teach you how to be a devil and set you up with us." He stood up and held out his hand, "come on. You're stuck with me now." She took his hand and he helped her up. "Let's go," he picked her up and took off from the tower, gliding along the way.
Meanwhile, the others were trying to fight off Grimm and White Fang members. Ruby and Weiss were trying to help others out and onto shuttles to get out of harm's way when Grimm was trying to attack. That was when they heard, "PAWNS, DEFEND YOUR KINGDOM! SO SAYS YOUR KING!" Just then a platoon of soldiers started to appear and fight off the Grimm. "You Have My Permission To Promote Yourselves If You See Fit." The fight was on, Ruby and Weiss looked over to see Pyrrha standing with a young man in armor. It was the man that commanded the army.
"Pyrrha!" Said Ruby, "are you alright?"
"I'm fine," said the Devil Queen. As she went to help the Pawns, she pulled out her Xiphos and with a quick slash killed one of the biggest Grimm. The others were in shock, meanwhile, Jaune looked to Ruby.
"Where are the others?" He asked.
"Ren and Nora are looking for you. Yang is in a medic tent and…" Started Ruby.
"Blake ran off somewhere." Said Weiss, "she abandoned us!"
"We'll deal with Blake later, show me where Yang is, I'll contact the others on the way. Pyrrha!" She looked over to him, "You Got This?"
"Go, I'll Take Care Of These 'Small Fries'!"
"PAWNS! Take Your Orders From Your Queen As If They Were From Me!" The PAWNS saluted and went back to fighting. "Now show me to the medic tent."
So they went to the med tent and saw hunters and huntresses being healed. Yang was out cold and her right arm was gone. Jaune looked at her and smirked. 'I can work with this.'
He gently woke her up trying not to have her in pain. Yang opened her eyes and looked at Jaune. "V-Vomit Boy?" She said weakly.
"Yeah, it's me 'Hot Head'."
"Where were you?"
"Long story, look I have a way to help you. But, at a cost."
"As with everything, what's the price?"
"Oh, I just have to turn you into a devil."
"Turn me into a devil?"
"Yep, you see I'm the head of a very powerful devil clan."
"But, I thought your sister was?"
"No, Jan's the heir of the Arcs. I'm the head of the Alexandria."
"How did that happened?"
"Well, about 70 generations ago, Sophitia Alexandria and made a deal with a very powerful evil to protect her family. But, she lost them so to get them back, she had to fight this great evil but by that time she had become one of the most powerful infernal beings ever, a devil. She quickly made herself known in the community as one of the most kind-hearted devils there. So with that, she became head of her clan. But, she still wanted her family to remain on the planet, see where I'm going here?" Yang nodded, "the Arcs were originally the Alexandria. She kept her name while in the Underworld and she made a test for her heirs. The way for one of her children to become the next head was these three ways: 1. They had to be male, 2. They had to have an immense aura, 3. They had to care about others and really want to do the right thing."
"All the things that pertain to you." Said Ruby.
"Bingo, before I left for Beacon, Dad handed me a box." He pulled it out, "look inside." He opened it up and it had chess pieces in it the only ones missing were the king and queen.
"So why are you tell me this?" Said Yang.
"I'm making you and offer," he said. "Become my rook and I'll clear your name. Hell, I'll do it even if you don't."
"You can clear my name?"
"I got all the evidence right here." He showed her the video on his scroll it was of Cinder, Emerald and Mercury having a meeting and Mercury removing his lower legs.
"Prosthetics! They were Prosthetics!"
"Yep, gonna show Ironwood later." Yang was thinking.
"If I agree, can I get my arm back."
"Dunno, you might."
"I agree to it, make me your rook," Jaune smirked and took a rook piece out. "By the way, what do the pieces do?"
"Well, the Queen is the most powerful piece. Bishops are powerful magically, knights are fast sword masters. Rooks are basically tanks."
"And pawns?" Asked Ruby.
"They are the most versatile." Said Pyrrha as she walked in. "The Grimm are destroyed, my king."
"Now you know you do have to say that Pyrrha. You are my queen."
"I know, but I want to be all business. So, who is going to be your Rook?"
"This is your Rook and Yang."
"I see."
"Alright, I, Jaune Alexander Arc, head of the Alexandria clan of the 72 clans command you Yang Xiao Long to rise and become my rook, serve me to the best of your abilities, til the end of time." Just then, Yang was surrounded by energy and started to lift off. Her right arm suddenly grew back and her, Ember Celica started to gain more power in them. They now had an onyx rook on the back of the hands. Her clothes were mended and her burning heart logo was now cradled by the double crescent moons, and had a golden rook in the middle of it.
Jaune saw it and smiled, "welcome to the family Yang." He said and gave her a hug, then kissed her on the temple.
TBC
Note: This is a story that was spawned from a Harry Potter what if idea. 'What if Harry was Lily's heir and Lily was Lilith?' Basically, fanon (don't know if it is or not) tell us the Arc clan were related to Sophitia (Alexandria of 'Soul' fame) so I did it where it a Jaune that was her heir and he became the head of a devil clan.