I do not own Kingdom Hearts or (most) of the characters used in this story.
I earn no money by writing or uploading this.
Vanitas lashed out viciously with his keyblade. His opponent blocked and slashed back with his two keyblades. Vanitas jumped out of the way and shot a barrage of Dark Firaga spells at him. They brushed past his opponents body and hit the ground behind him, not a single one found their target.
Vanitas landed back on the ground and sent a few tendrils of darkness to probe through the smoke, looking for his opponent. But they returned quickly, finding nothing in the quickly clearing haze. Dumbfounded, Vanitas did not notice the shadow that formed behind his back, the one that raised its two keyblades and was poised to strike.
Thinking something was off, Vanitas spun around, just in time to stop the keyblades with his own. But instead of breaking off, and attacking again like Vanitas thought he would do, he kept his position and forced his keyblades against Vanitas's.
Shocked by this sudden move Vanitas fumbled and let his opponent gain the upper hand. With the keyblades inches from his face Vanitas finally managed to push back. Now locked in a battle of strength between the two keyblade wielders Vanitas began to feel cocky.
He knew he was the stronger of the two and so did his opponent. However instead of an expression of fear Vanitas was expecting he wore a grin not unlike the one Vanitas himself wore. Vanitas frowned, reinforced his stance and pushed against him harder hoping to end this battle quickly. But even with the keyblades pressing against his face he didn't lose that smile.
Vanitas snapped.
"Why are you still smiling!"
He shouted hysterically.
"You've lost! Stop it! SURRENDER!"
In a soft tone, his opponent whispered. "You're not the only one who has magic." With those words powerful beams of light and darkness streamed out of his dual keyblades, and started arcing towards Vanitas.
He ran and started to activate his own magic, forming a shield of darkness around him. Just in time as he heard the beams crash down on his shield, threatening to break it. Crouching in complete darkness, under the cover of his shield, Vanitas began to slow his breath and calm down. He dissipated a small part of his shield to allow him to see outside.
As he scanned the barren wasteland, he saw no sign of his opponent. Feeling more confident he dissipated the rest of his shield, exposing him fully. He turned around, searching for his opponent. Nothing. He could not be found. Vanitas spun around confused, there was nowhere to hide, so where had he gone.
"Come out and face me coward!"
He shouted at the empty air. "If you insist!" Shouted a voice above him. "Drive Power, Radiance Form." Vanitas barely managed to flip out of the way as a giant beam of light hit the ground where he had just been standing.
Vanitas looked up at his shining opponent, they had changed from a grey coat with spiraling patterns of white and black, to a purely white attire that looked like it was being lit up by the sun itself. Beams of bright light shot from his two new pure white keyblades, cascading down on Vanitas, he struggled to defend himself from the onslaught of powerful light magic.
Finally the beams stopped and the wielder of light fell back down from the sky. Vanitas lay on the ground defeated, his opponent walked up to his unconscious body and placed a foot on his chest.
"I win."