These gems are only useful to the shinigami that owns them, and if the shinigami dies, the gems are destroyed as well. Once per day, a shinigami can hold up a gem that currently contains a soul and crush it, permanently destroying the soul within and releasing a 30-foot-radius burst of negative energy that inflicts 6d8 points of psychic damage on all creatures in the area of effect. A successful Death save reduces this by half. The soul destroyed in the process of using this ability can only be brought back to life by means of a miracle or wish spell. This is a death effect.