Death: the End of the World

Soul Society's "Joureiitei Reconstruction Plan" was launched. In order to improve Soul Society's defense capabilities, the Technology Development Bureau tried to open up the three-domain energy channel of "Broken World - Real World - Hueco Mundo", but accidentally tore the "blank zone" on the edge of the Broken World, giving birth to a new species "Reverberant" that is neither Hollow nor a Shinigami. "Reverberation" feeds on the undissipated "obsession fragments" of the deceased. The soul of the devoured person will be completely annihilated and unable to enter reincarnation, breaking the fundamental rule of Soul Society's "soul cycle".