The Saint of the Single Flower (一輪の聖者 Ichirin no Seija ), also known as the Goddess of Fate (運命の神 Unmei no Kami ), was the only person who managed to defeat the Majin.
She is the protector of the world and its peace, and is also responsible for selecting warriors to become a Brave.
The warriors prove their worth in front of a statue of The Goddess in the Temple of Fate, and if they are chosen they receive a Crest of Six Flowers.
Later on, it's discovered that she is still alive while mummified, due to her ability to change the fate and avoid death. Her powers were stolen by Nia Grasta, an acolyte that failed to become a Saint and feared death, under the orders of Tgurneu. Later her powers were bestowed by the acolyte to Raina which helped him avoid of completely losing his mind after turning into a Corpse Soldier.
Her history is later revealed by Dozzu who explains that by observing the past with Hayuha Pressio he learned that the Saint of Single Flower was not captured but sealed herself deep into the earth. Her disappearance is speculated to be an attempt to prevent her powers from being passed down and abused by others who inherit it. Using two Sacred Instruments: the chair she sits on prevents people or Kyouma from entering or remember anything that approaches her body. The second is a chain used to prevent herself from escaping or being moved in the area. The place she sealed herself later became the temple where the Black Barren Flower was created and Tgurneu base of operation to prepare for the Braves.
it was stated that the saint was capable of fighting alone against the kyoma,living for more than 1000 years, and create two of the Sacred Instrument that had effects of not allowing anybody to get near to her, and making her unable to escape from the temple of fate in kyoma territory. so it is easy to think that she is probably one of the most (if not the most) powerful entity in the series.
Still, it is revealed later that in her battle against the kyoma she lost some fingers and even got a scar from the Demon King, Zophrair.