The sword is originally used by Ninetails, but Lechku & Nechku can summon it as one of their attacks and Yami's fourth form's arms can turn into two imitations of this weapon, suggesting Yami gave Ninetails the sword originally, making Ninestrike on the same level as Divine Instruments. However, the sword is not obtained after Ninetails's defeat and is seemingly destroyed with it.
- Ninestrike has a brush dipped in crimson ink at the pommel, like Denkomaru, but Ninetails is never shown to use this brush to interfere with Amaterasu's Celestial Brush techniques. What Ninetails used to interfere was his central tail, similar to how Amaterasu used the Celestial Brush.
- In the center of the Underground Ruins, a Ninestrike-like lightning rod receives the lightning generated from the Thundercloud and powers the lightning-based security system of the entire ruins.