Non-Rainbom Twilight

The Sonic Rainboom that Rainbow Dash did and make all of them earn their cutie mark didnt happened, but because Twilight is a persistent pony and wanted to study, she turned to science and her first goal was to give birth to that dragon with her science, she lost her right fore leg by doing it but it was worth it and now this mecha leg is more then usefull for her.