The title of this article is conjectural. Although it is based on canonical information, the actual name of this subject is pure conjecture. It may be supplanted at any time by additional information released from canonical sources.
The Shitōshin, along with an army of yōkai, invaded Hōraijima when it returned to the outside world. The priestessKanade sealed up their true powers threw into the Cauldron of Resonance at the cost of her life. The Shitōshin corrupted the cauldron and sacrificed a hanyō on the island every 50 years to reclaim a small portion of their power. The box was eventually removed by Inuyasha when it was given to him by Kanade's spirit. The Shitōshin could sense that the box had been moved from the cauldron and decided to obtain it. Inuyasha lost the box after being confront by a replica of Kikyō that was under the Shitōshin's command. The replica Kikyō then used her spiritual power to open it and release the spheres.