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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The Archmage is passing, and Twilight is the best candidate to replace him.
Twilight discovers the crystal mirror, and all of the worlds that have been created as consequences of her actions are suddenly open to explore. What will the Archmage discover?
Thousands of years following the story of Archmage, Twilight takes on a new student. One who doesn't know the first thing about advanced magic. One who needs to start from Square One.
Twilight Sparkle was and is one of the greatest Archmages known, but nopony gets -that- good without some development. What does it take to make a regular unicorn into the greatest of her era? And more, to become a Princess?