Murasame

One-Cut Killer: Murasame was a long katana Teigu used by Night Raid's Akame. Akame Ga Kill!: Zero reveals that it was formerly used by Gozuki, who personally trained Akame. It was later destroyed by Esdeath during her final battle with Akame.

Abilities
Murasame was a cursed blade that could kill a person with a single cut. Once the sword pierced the skin, a poisonous curse spread through the victim's body, killing them within seconds by stopping their heart. The curse appeared as black markings that originated from the wound and spread across the victim's skin. These markings vanished once the person had died. In the anime, the markings remained permanently on the victim's heart. Akame stated that cleaning Murasame was very dangerous because of its ability, which is why she used gloves when wielding the blade. However, this ability only worked on living, organic beings that have a heart, rendering it ineffective against Armor and Biological-type Teigu as well as machines and Yatsufusa's corpse dolls. Esdeath showed that it is possible to survive the curse by cutting off the affected bodypart before it can spread through the rest of the body. However this must be done quickly, as Esdeath even stopped time to amputate her arm. The curse's black markings remain visible on the amputated bodypart.

Trump Card
Murasame's trump card was a performance enhancer titled Little War Horn that strengthened its user with the power of its poisonous curse. When the trump card activated, the user's scleras turned black with black markings appearing around their pupils and a dark aura enveloped their body. Red markings also appeared all over the user's body and remain as scars once its effect diminished. The trump card placed considerable strain on the user's body and only lasted for a short amount of time. Akame only used Murasame's trump card during her final battle with Esdeath.

In the Manga, Lubbock mentioned that Akame cannot use her trump card supposedly for unknown reasons. Later, Akame revealed to Tatsumi that in order to use Murasame's Trump Card, one must discard their humanity and embrace their inner demon.

In the anime, the trump card is activated by cutting oneself with the sword and resisting the poisonous curse, therefore accepting responsibility for all the lives taken with the weapon.

Trivia

 * Murasame literally means "village rain" and is often associated with a type of rain that falls hard, then gently, in fits and starts.

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Murasame Мурасаме 一斬必殺：村雨