Stagnant Soul

Stagnant souls (ヨドミ, yodomi, lit., "stagnant") are souls of dead people who remain in the Threshold, awaiting purification. During their stay in the Threshold, they manifest their wishes and live quiet lives, although not everyone would share the same experience. Some would transform into corrupted souls and these souls, if left unattended, can endanger the lives of other stagnant souls and upset the balance of souls in the Threshold. Because of this, Black Stars were created to answer to these threats and purify the souls using their weapons.