The Name of the Mana Technique

'Drip.'

'Drip.'

Rin had an angered look on her face as she swung her sword with all her strength.

Each second she was slicing apart the space around her multiple times without taking a break.

This was the method that Darius had taught all the students of the black house in the first class.

To swing one's weapon with all their strength.

Thus, not only but everyone was doing the same action with their weapons. Some had different weapons than the sword that Rin was swinging around but it didn't mean that they were slacking off. But doing so took a considerable amount of effort and focus to keep all the swings almost the same which will only happen when all of the swings will have the same strength applied to them.

The same strength was their whole strength. 

That was also the reason why Rin was angered. Her eyes kept on moving up as the laughing sound from Nina entered her ears.