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Within Aruliel's consciousness, there were two voices speaking to her, the light, and… the darkness.
There was the light, which sounded like her voice, but more mature, and more adult, more correct as well, it felt as if this light part of her was the correct one, the one that never cried, that always kept her emotions inside of her heart, the perfect Aruliel.
And then, there was another, malefic voice, a voice that came from the darkness of her own heart, the infected part that was her dark emotions had been devoured and assimilated by the fragments of the Forbidden One, which had also become part of her own body and soul.
Check "The Protagnist's Sister Is Actually the Strongest"!