Ryuji

Ryuji saw how useless his normal crystal was against Black crystal. It was then he had an idea. He decided to infuse his crystal in his body with shadow dragon magic, turning the crystal black and strengthening it. Then he thought why stop there, he carried on infusing crystal with more and more magic until he had infused the power of every type of dragon slayer. The crystal now glowed and shimmered and it was covered in dozens of different colors. He smiled as he looked to Stone and said.

"Let's see how your black crystal fairs against my rainbow crystal."

He decided to repeat his last attack but stronger, Roar of a Rainbow Dragon using the power of all the types of dragon slayer magic. 

Sabrina and Selena. 

While Bahamut was fighting the Dragon Slayers and Stone was ordering around his men, Sabrina had enough time to make her way over to Jackie. She used an ability called Doctor Blythe, suddenly a large doll appeared over Jackie as it began to heal him. She used In on it to keep it hidden from everyone else while she teleported over to Morrigan as she said,

"I can sense how much you hate your father and with your help, with the two Dragon Slayers, and you brother and even Jackie over there. We should be able to take him down together and you will finally be free to live your life your own way and I don't think we will have to worry about Reggie or Selena interfering. I don't think they will help out your father unless they were ordered to, and your father doesn't strike me as the guy who orders people to fight his own battles."

Assuming Morrigan agreed, Sabrina would lend her a large amount of energy to help her fight. Just as she finished talking to Morrigan Stone Black Crystal energy wave as well as Black Crystal spikes. She picked up Morrigan and jumped behind the crystal spikes, dodging them carefully as the crystal shockwave came at her from her front. The crystal spikes acted like shield protecting her from the wave. Selena listened to Stone's orders to kill Raiden. She knew it would be an easy task. She wouldn't even have to release Oshikuru. She simply teleported next to him and placed her right hand over his heart, as she used her energy manipulation to send a beam of energy through his chest. Raiden coughed up blood as he passed out bleeding heavily. Sabrina seeing this, used her portal to teleport Raiden's body to her as she used Nen stitches to repair his heart and to close his wound. Sabrina was getting a little worried. These guys were out for blood and she didn't know how long she could hold out. Luckily Jackie was waking up, Doctor Blythe had done it's job.