This story is a sequel to Power Surge

Takes place ten years after the events of "Power Surge"

Rejection
There may come a time when the powers we gained so long ago, the skills we fought to refine and keep at their peak will need to be put to the test. That time has come, and Twilight must show that she is ready to push herself to her limits and beyond. For if she does not, everything will be lost.

Thanks to This guy! for the new and awesome cover art

Training Session
We all knew Twilight Sparkle was a powerful sorceress, but none of us had ever realised just how powerful she truly was. It is no underestimation if somepony said that she’d be able to challenge an immortal to a battle and come out as the victor. The possibility was there, of that there was no doubt, the only thing that was needed for her to actually defeat an immortal, such as myself, was for her to realise her full potential, for her to realise just how much power was stored in that small body of hers