Hoshigami Style.
It was Lumina's personally created sword art.
She took inspiration from Shin's sword art and his family's technique to create a deadly combination that would result in absolute destruction.
This technique worked better with the Moonblade, as the Moonblade allowed channelling a huge amount of mana into the body.
Though, without the Moonblade, the Hoshigami Style could be near impossible to use, Miss Lumina could still do it with any sword.
She could draw mana of that calibre without the Moonblade.
Leon was stunned when he found out.
But he soon figured out how she was able to pull it off. She must have used the sword style so many times that her body was now able to perform it naturally.
On the other hand, Leon failed.
"How did I even mess up the aim?" He muttered under his breath as he kept on walking.
"Did I apply too much force?"
"No, no," Leon shook his head, denying his own question, "the force was perfect, just like her, or it could be because—"