Useless Saintess Counterattack Manual

Reborn as a disgraced saintess stripped of her power and dumped by her fiance, a brilliant physicist uses modern science to shatter the realm's rules. Armed with deadly lightning arrays forged from physics, she exposes a sect conspiracy and outsmarts a demonic invasion. As former rivals beg to be her disciples and her ex-fiance watches in secret awe, will her scientific mastery be enough to conquer the looming darkness?