Olivier

Olivier (オリヴィエ) was one of the three heroes who defeated the demon Diabolos. In reality, however, she was a pawn of the Cult of Diablos, being the only survivor of their experiments with the demons' cells and tasked to defeat it for their own ends, which she did in hopes that it would also create world peace.

Appearance
Olivier is described as a beautiful, gallant, almost divine even, figure of a woman warrior. Her appearance looks like a mirror image of Alpha.

Synopsis
Many years ago, Olivier cut off Diablos' Left arm with her sword then sealed him in the Holy Ground. Then she was cursed by Diabolos that her descendants would be possessed with rotten bodies.

However, the truth was, Olivier was one of few people who are compatible with Diablos's cell. She was tasked by the Order to gather more Diabolos cells.

In recent years, someone managed to summon her via Trial of Goddess but Olivie won the match.

Holy Ground Infiltration
During the infiltration of the holy land, the girls, Alpha, Delta and Epsilon manage to infiltrate the temple with the help of their lord Shadow, along with Beta (disguised as Natsume), Rosa, Alexia, and Nelson who held him hostage. There Alpha reveals the truth of everything as well as her relationship with Olivier, and how Olivier is treated as a real man, she is a woman and how the cult distorts history, and for more later Nelson reveals himself and tries to kill everyone but Delta and Alpha confront him without problem.

Then Olivier is summoned as a puppet with no will of his own but with great magical power by Nelson to eradicate the members of Shadow garden, but they retreat before Olivier started fighting them, especially with Delta, who was in ecstasy for fighting, after having defeated more than a dozen of Nelson's magical copies.

Later, Olivier is ordered by Nelson to kill Cid who was there along with Aurora ghost, Cid manages to dodge just her deadly cut, but then after receiving multiple wounds, in the end he receives a fatal wound from Olivier (fake), but Cid takes advantage and destroys her neck to later impale himself and get rid of multiple Copies of Oliviar, and at the end he destroys the entire temple together with Olivier (false) and Nelson.

Powers & Abilities
The only survivor of the Cult of Diablos' experiments with the cells of the Demon Diablos, it can be assumed that Olivier was considerably powerful, capable of defeating the demon and sealing it away.