Kanade's comb box

Kanade's comb box is a jeweled comb box which was used by the priestess Kanade to seal the Spheres of Power used by the Four War Gods. It was thrown into the Cauldron of Resonance, though eventually it was removed by Inuyasha, who lost it to the Four War Gods' servant, a replica Kikyō. The replica Kikyō then used her spiritual power to open it and release the spheres.