Grease

Olba (Grease; Light Novel) is a member of the Order of Diabolos who joined to get a cure for his daughter's condition.

Synopsis
Olba kidnaps Claire and questions her in her cell. She recognize him for his defeat against princess Iris in the first round of the tournament during the Festival of the God of War. Olba asks her if she has issues controlling her magic and appearing of black spots. Claire confirms, but states that after her brother's treatment, she is fine. Olba realizes she is compatible and gets interested in her brother, but upon hearing that Claire free herself, stating that she will kill him if he do something to her brother. Olba manages to knock her out, but then his men inform him of invaders.

Going into the hall, he finds Shadow Garden and is surprised they knew about Diabolos Cult. He gets easily defeated, but uses berserk magic and manages to escape. He ends up meeting Cid Kagenou who toys with Olba. Olba uses strengthening pills, gaining immerse strength, but is easily overwhelmed by Cid.