Natasha
The Keyblade of Heart is a Keyblade created from the hearts of the Princesses of Heart, with the exception of one... This Keyblade has the ability to unlock a person's heart, releasing the darkness within. 

The Keyblade of heart, came into existence when the World was reorganized after the Keyblade War. Without this key, Kingdom Hearts is forever beyond a person's reach. Only by gathering together hearts of pure light—hearts completely devoid of darkness—may one forge a Keyblade of heart and open the door to Kingdom Hearts.

Final Battle](<

*Echoes of the Assault on Hollow Bastion rang through the halls, bouncing from wall to wall. Each individual clash or cast sang its own tune; the cacophonous song of battle. But one such song rang a familiar tone; one so recognizable as to stand the test of time. Two opposing forces locked in battle, the Light and the Darkness. The Beacon of Hope vs The Encroaching Darkness. Their last clash shook this world to its very core, yet lasted the duration of a lightning's strike; for if their confrontation were to be drawn out, they would surely destroy themselves trying to overcome their eternal foe.*
Heather
*Ikazuchi slid back after blocking a lightning ray from Inaxuma. He grit his teeth from the injuries sustained from fighting off the Mimic Master that was masquerading as Inazuma at the Rising Falls. He could manage fighting Inaxuma 1-on-1, but fighting* ***Two*** *Inaxumas at once was a tall order to fulfill. He barely managed to squeak a victory over the Mimic Master, since its copy of Inaxuma was outdated, and not up to his own strength. But this... This was the real deal.*
Bradley
"We both know you can't win this. At full stamina, you and I are evenly matched. But you've been weakened. Although not above these underhanded tactics, I would prefer I got you to this point on my own. No matter, as soon you will perish and *I* Will *Finall* Be the victor!"

*Inaxuma brandished the Keyblade of Hearts and pointed it at Ikazuchi.*

"Your meager life will come to an end soon enough, and the princesses will be used to obtain ultimate power. Give up your master's heart so we can unlock the final keyhole!"
Heather
*Ikazuchi slowly pushed himself to his feet and faced Inaxuma.*

"You want my Master's power? Here, I'll give it to you."

*Ika held his hand to his heart and closed his eyes, as he began to glow with a brilliant light. His form began to change into that of the Princess of Heart.*
Andrew
*The light dispersed into sparks that drifted away from them. Ikazuchi opened their eyes, which locked immediately with Inaxuma's.*
Heather
*When the smoke cleared, Ikazuchi was returned to normal. He fell to one knee as his keyblades clattered to the ground. He coughed as he struggled to remain upright, but looked up in shock.*
Bradley
*Inaxuma stood before Ikazuchi, unchanged from the attack. Except for the fact that he was missing an arm. He gripped his side as the wound leaked globs of shadow and darkness.*

"You- You light-loving bastard! That almost killed me!"

*Inaxuma looked at Ikazuchi with a face of disgust, as he nearly doubled over from the injury.*
Heather
*Seeing an opportunity to strike, Ikazuchi quickly picked up Light's Aria and dashed in to strike at Inaxuma, who return-blocked with his dark copy of the keyblade. That's when Ika noticed that his voltic rush obliterated the arm that Inaxuma was carrying the Heartblade in. While the two blades were locked together, Ikazuchi frantically looked around the room for the Keyblade of Heart, seeing it on the floor to the side of the Final Keyhole.*

*Thinking quick, he used the last of his energy and thunder rolled under Inaxuma's blade to the Heartblade, swiftly picking it up in the motion. He turned back to Inaxuma and pointed the keyblade at him.*

"It's over. I have the Keyblade of Heart, there's no way you'll be able to open the Final Keyhole without it!"
Natasha
*Almost as if on queue, the room began to shake as the Final Keyhole swirled and leaked darkness.*
Bradley
*Inaxuma smirked as he backed away from Ikazuchi.*

"The Keyhole cannot be completed so long as the last princess of heart still sleeps... Yes, and without her power, the Keyhole will remain incomplete and unstable. And while unstable, it will surely collapse and destroy this whole world. How does it feel, Ikazuchi? To be the cause of both of this world's downfalls? It's almost poetic."

*He opened a Dark Corridor and began to slowly back into it.*

"Your friends will all die. And it will be your fault, all over again..."
Heather
"No- I..."

*Ikazuchi looked back from the Final Keyhole to see Inaxuma's Dark Corridor closing. He took a step towards where his enemy was standing, but fell to one knee again.*

"This... Wasn't supposed to happen... Not like this!"

*Ikazuchi looked between the two keyblades in his hands: Light's Aria and the Keyblade of Heart.

"The Keyblade of Heart... Has the ability to release a person's heart... Within my Heart is..."

*Ikazuchi's eyes widened as he thought it over, before he turned the keyblade around, and held it to his chest.*

"Master Aria... Suke, Xerx, Xion, Dado, Fiora... I'm sorry."

*He closed his eyes and pressed the keyblade down.*
Natasha
*A shimmering gold light surrounded Ikazuchi, as four hearts flew free from his chest. He didn't even have a moment to open his eyes, as his body, too, began to dissolve away into gentle sparks of light.*

*The keyblade of heart, having surved its purpose, clattered to the ground and shattered into the six hearts within it, return to each of the princesses. They all would begin to stir right as the Boy was vanishing... If one were to wake up soon enough, they would be lucky enough to see him still standing there.*
Dillon
*Having her heart return to her after the Keyblade of Heart shattered, Fiora woke up from her slumber and looked around confused. Wasn't she just being put to sleep in that pod by Ina? She didn't really have time to ask questions when she saw...*

"Ika..?!"

*She jumped up and rushed to him, seeing his body begin to dissipate. No! No no no!! Not again! She couldn't lose him, not again. With all her might she reached out to catch him, but upon making contact, he vanished within her arms, the light particles fading in-front of her eyes.*

"IKA!!!!"

*Fiora's heart began to glow bright and the air around her get cold. She clenched her fist and yelled, slamming herself down and causing a shockwave of light and ice to shoot out from her, coating the area with ice and blinding the area around her. Her cries rang out loud enough that the entire castle could hear if they focused...*
Melvin
*Nearby Fiora, one of the hearts from Ika would float around, aimlessly. It would seem to not have anywhere to go, until it moved to the ground and a body would form around it. Landing on the cold ground, Aria laid there still unconscious. One of the missing masters has returned..*
Natasha
*The remaining princesses would begin to stir, but would need more time before they could properly move on their own.*