Training Starts!

[Various!SSB x Reader] Two voices call out to [Y/n] in a dream. One a bright and warm voice talking of nothing but a world of shining light! How dazzling that world must be... The other is a somber and cool voice that speaks nothing but a world of eternal darkness. How serene that world must be...
But which one is better? Which one is worse? Is right to pick one over the other? Or... Can there be a balance?
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That dream is a prophecy, a peak into the future. A girl is tasked with saving the worlds of all the characters she adores and loves, including her own. There's no turning back now for her destiny is set.
A new chapter is opened but how will her story end?