There's some regicide, a stolen magic sword, and some flashy sympathy magic, but mostly this is a story about an immortal witch and the way she traps herself in her own mind with the terrors and regrets of centuries of living in the world.
The Fallacy of Regret
Queue swirling lights and rushing sound effects as we go back in time to stop regretting things and make our lives go how we wish they could have gone, with all of the wisdom and hindsight of our later years. After an arbitrary passage through time and space, we find our former self, and we say something like “hey, don’t invest your money there, use it to start the business you’ve always dreamt of.” Then, ignoring all considerations of paradox, physics, entropy, and causality, we zip back to the present time to see how much better our life us now that we made the choice we always wished we had.
IGC Publishing 