Kakashi stood in the shifting mirror dimension and watched the Ancient One carefully. The amount of magic pouring from her body was far beyond normal. It also feeled different.
'The energy she is giving off is not the usual eldritch magic,' he thought. 'And that dark mark on her forehead is new. It looks like a seal, similar to the forehead seals that Lady Tsunade and Sakura use. But this one feels different. It is boosting her power by a huge amount.'
He was interrupted in his thought.process as sharp mirrors rose from the ground like spears, trying to impale him from every direction. Kakashi let his body become intangible with Kamui. The mirrors passed straight through him and shattered against each other. Glass fragments hung in the air for a moment before falling.
He became solid again only for the mirror walls around him to move towards him. Hundreds of mirrors closed in from all sides, trying to crush him like a vice.
Kakashi used Kamui once more. His body phased just in time. The mirrors slammed together against each other. Where he had stood, only broken glass remained.
'She can bend reality of this dimension with her power. Troublesome.' Kakashi thought
The Ancient One fought his five lightning clones at the same time. She blocked their strikes with orange shields and whipped energy fans. She also changed the reality around Kakashi to stop him from forming hand signs.
Kakashi noticed her physical strength had also grown greatly. She matched the clones blow for blow. The only thing that kept the clones alive was the Sharingan, which made it easy to predict her attacks. Yet she kept up without breaking a sweat.
Kakashi decided to help his clones from a distance. He focused on his Mangekyō and blinked.
Raijin no Taikō was activated as he released a silent shockwave from his eye.
She was busy blocking clones and could not dodge. But she still recognised the threat. Mirrors rose quickly to protect her. Some cracked under the pressure. Pieces fell like rain.
Kakashi blinked again and again. Shockwave after shockwave flew toward her. More mirrors appeared and shattered. The dimension shook with each impact.
The Ancient One changed the reality of mirror dimension once again with a wave of her hand. The mirror floor Kakashi stood on flipped upside down. Gravity shifted. He did not fall. Shinobi training let him stick to any surface. But the sudden change blocked his view of her and thus he could not active his ability.
Before he could react, the Ancient One appeared from the mirror below him. An orange sword of pure energy formed in her hand. She struck fast.
Kakashi was half a second too slow to phase. The blade cut across his stomach. Blood sprayed. The wound was shallow but painful.
The lightning clones rushed to help. They surrounded her and destroyed every mirror she tried to use for teleporting. She could no longer jump through reflections.
"She can teleport through mirrors too. This is definitely new." Kakashi realized.
He placed a hand on his wound and used Mystical Palm Technique. Green healing chakra flowed from his palm. The cut closed slowly. The bleeding stopped.
'She is serious,' he thought. 'That strike was meant to kill me. She is not holding back. She really did not like my threat about exposing Kamar-Taj. I thought she was more sensible than that. But how can she be sensible when she is using that power.'
Kakashi had realised that the ancient one is using forbidden dark magic from the Dark Dimension. He had read enough books in Kamar Taj to know why it was forbidden l.
Kakashi finished healing himself. He stood straight.
'Good,' he thought. 'That means I do not have to hold back either.'
Mirror spikes kept rising from the ground beneath him. Kakashi ran across the shifting surfaces. Sharp glass chased his feet like hungry sharks.
He poured chakra into his right hand. A blue Rasengan formed on his hand as he continued to dodge the mirror spears.
'Now time to add some nature transformation to it.'
He was not going to add wind nature like Naruto. He would use his strongest affinity: lightning.
Lightning chakra mixed with the spinning orb. The colour changed to bright white. Crackles filled the air.
Kakashi used his Mangekyō ability Ikazuchi no Mai to control the shape of the Rasengan as well as to control the lightning. The Rasengan stretched and sharpened. It became a long spear of pure lightning, longer than he was tall.
He jumped high into the air. For a moment he saw the Ancient One clearly through the chaos of mirrors.
The ancient one seemed to have looked into the future and was ready to meet the attack.
Hundreds of mirror walls rose between them like a fortress.
But it did not matter as Kakashi has already locked on to to her position.
He threw the spear and continued to use Ikazuchi no Mai to guide the spear and control the lightning to increase its speed.
It left his hand with a sonic boom. The sound cracked like thunder. The lightning spear moved faster than the eye could follow.
It punched through the first mirror. Glass exploded.
It punched through the second, the third, the tenth.
Every mirror in its path shattered into silver rain.
The spear kept going, straight and true.
The Ancient One turned at the last second. Her eyes widened.
The lightning spear hit her in the chest.
It went straight through.
Blood burst from her mouth. The orange glow around her faded. She looked down at the smoking hole in her robes, then up at Kakashi.
She smiled, small and tired.
She took one slow breath and fell to her knees. The Ancient One breathed her last.
-----Author Notes---------
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