Murasame

One-Cut Killer: Murasame is a Teigu in the form of a long katana that is used by Night Raid member 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 is a cursed blade that can kill a person with only one cut. Once the sword pierces skin, a poisonous curse spreads into the victim, killing them within seconds by stopping their heart. Akame states that cleaning this weapon is very dangerous because of this ability. However, this ability only works 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 of 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 is a performance enhancer titled Little War Horn that strengthens its user with the power of its poisonous curse. When the trump card activates, the user's scleras turn black with black markings appearing around their pupils and a dark aura envelops their body. Red markings also appear all over the user's body and remain as scars once its effect diminishes. The trump card places considerable strain on the user's body and only lasts for a short amount of time. Akame only used Murasame's trump card during her final battle with Esdeath.

In the Manga, Lubbock mentions that Akame cannot use her trump card supposedly for unknown reasons. Later, Akame reveals 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