Louise had always thought herself to be a weak mage, but she wasn't. She was more powerful than she could ever comprehend. Zelda recognized her potential as soon as they met, and knew she only needed someone wise enough to guide her. Zelda, meanwhile, only needed someone powerful enough to challenge her greatest foe.
Kelsier spoke of a world before the Lord Ruler, a world where plants were green and ash didn't fall from the sky. That was crazy, of course, and even if such a world did exist, Vin knew she would never see one. But she had been wrong before, and Louise de La Valliere needed a familiar.
Vin finds herself stranded in Brockton Bay in the middle of the Leviathan fight. Hopefully with the help of a new friend, she'll be able to survive.
The Triforce was stolen, the hero slept, and Zelda could no longer remain in Hyrule. Impa told her of a place where she would be safe beyond the reach of the King of Evil, a place where she could grow stronger than she was. A place called Konoha.