Star's Salvation: Lost Echoes

Stranded in a world where technology took a backseat, the Guardian finds herself entangled in the intricate schemes of the divine entities that govern this unfamiliar realm. Caught between the rivalries and power struggles of these so-called godlike beings, she must navigate a treacherous path, maintaining her own neutrality all the while searching for a way back to the place she once called home.

It was just asshehad foretold; in the end, they are nothing more than vessels for the universe...

(PSO2/New Genesis/DanMachi Crossover Fanfiction)