The goddesses nine rings

A name girl aria has a dream to become a Sacred Warrior to save the world and reclaim the nine rings but something happened in her road to success making her switch her goals to defeat all non-human entities which she thinks its all theirs fault for her parents death, however on her to her goal she discovers so much more.

Who is this unknown goddess?

Why did the rings get a mind of its own?

Why did dungeons/towers appear?