Nigeki Kessatsu

is the primary technique of Suì-Fēng's Shikai, Suzumebachi.

Description
As its first step, Suì-Fēng stabs her enemy with Suzumebachi's blade. In addition to creating a rather deep wound, the attack leaves a butterfly-shaped stamp on the victim’s body. Spreading from the center of the wound, known as, this stamp becomes the target of Suì-Fēng's second attack. If struck in the same spot that was hit the first time, the person will inevitably die, and thus illustrate "Death in Two Steps." When the ability takes effect, a larger crest quickly spreads out from the two smaller ones, completely destroying the victim's body.

The crests are maintained by Suì-Fēng's will, and are impossible to remove unless she wills it; when Yoruichi Shihōin was still in charge of the Onmitsukidō, Suì-Fēng could only maintain the crests for half an hour. However, for a target of superior Reiatsu, such as Sōsuke Aizen, the crest can be forcefully removed.

The mechanics behind Suzumebachi's ability take effect not through the point of entry, but rather the point of actual surface contact. This ability is caused by a venom that Suzumebachi secretes. When it enters the target's body, it spreads throughout their body in a matter of minutes, if not seconds, destroying it without a trace. The effect of the poison takes slightly longer to work for those who have enhanced spiritual power.