The crystal mirror is a strange device. Through it, Twilight is able to explore alternate worlds, each one of which has been created as a result of her decisions. As she soon finds out, some of her past decisions really were for the best. And others still could have been better. The former Archmage learns how her decisions could have impacted Equestria, and grows through them. She learns what would have happened if she had become a goddess, if she had denied the position of Archmage, and many other situations. What's more, she discovers the impact some other ponies' decisions have had on Equestria's well-being, and how they have effected those she loves.

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