a hundred years ago amaterasu battled Orochi and defeated him at the cost of being severely wounded. now Orochi has returned. with no other choice, a still injured amaterasu as well as her guardian chose Ruby Rose to fight in the mother of all's place as the sun priestess

Four years since Yami's end, the celestial planes were at peace. Now, the false gods ask for help from the warrior that slayed Yami, Amaterasu Ōmikami, the sun goddess. (1 Month before Canon)

Amaterasu is still weakened from her last war with the Dark, so instead of heeding Sakuya's call she sends one of her bloodline in her place, a girl from another world, named Ruby Rose.

A not so serious SI fanfiction where me and Chibi have to deal with living in Remnant

She is no longer needed, the world is safe so for now she sleeps. Waiting for the day someone comes to wake her if there is ever any trouble brewing in the horizon. But now, when many centuries has past and no one comes for her aid as evil has slowly crept upon the land without her knowing. It seems her quest to bring peace to the world has started once more.

While undergoing her initiation into Beacon Academy, Ruby Rose stumbles upon a long lost power that could forever reshape the world of Remnant and bring forth a new age of peace. But dark forces conspire against the light, and threaten to extinguish it entirely...