Raikiri

Raikiri (雷切, Lightning Cutter) is the famed Noble Art of Tohka Todo, in which she earned her namesake.

Description
Described as an ultra-electromagnetic battōjutsu, in which Tohka charges her sheathed blade with lightning, then after she creates a magnetic field around both the blade and sheath; she is able to unleash a slash, which moves at an immense speed surpassing the speed of sound as well as releasing both blinding light and a huge amount of heat in the process. Raikiri grants Tohka a near invincible advantage in close range battle. It is also possible for her to be able to cut through a bolt of lightning.

In fact, the Raikiri easily destroyed both the Hisuijin and Byakuya Kekkai of Shizuku Kurogane, as well as her lighting, being able to affect the assembly hall used for her match.

Weakness
Due to the Raikiri being a sword drawing technique, it can't be cast continuously without having the blade return to the scabbard. Furthermore, while the Raikiri is powerful, it can still be withstood or even overpowered as seen with both Kurogane brothers. Raikiri excels at close combat, but once the opponent can strike outside of Raikiris distance, there is little to no chance of winning using Raikiri, as seen when she fought Yudai Moroboshi in the previous Seven Stars Sword Art Festival.