Spiritual Threads

 is a technique used by Muramasa and his master, Kōga Kuchiki.

Description
Muramasa and Kōga can create invisible spiritual threads with hands on their ends, which they can manipulate to bind and immobilize their target. They can also use these threads to strangle their opponent. While invisible to the naked eye, these threads can be seen in reflections, such as those of windows or water. If the reflection is distorted, the threads will disappear. Additionally, the threads will dissipate if Muramasa or Kōga lose their focus on their target, as demonstrated when they disappeared due to Muramasa coughing violently. In turn, sufficient cutting can sever the threads.