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Kireina looked at her own reflection. Her eyes shone with bright light as she seemed to have grown more wary of the entity she was fighting. This being that reflected her own self was not something our mischievous fairy could easily play around with.
She had already realized that this entity was way too powerful, it couldn't be easily played with. She had already grown decided to destroy it quickly before it was to grow any stronger.
And this was because she already realized it was learning, with every single move she unleashed, the reflection would somehow manage to find a way to copy it and fight back against her, however, Kireina simply was going to go beyond that point.
She had many powers backing her up, and unlike her reflection, she had Path Jewels, something that the reflection was unable to copy!
Check "The Protagonist's Sister Is Actually the Strongest"!