[He's almost surprising himself with his patience in explaining this, here. But few enough humans understand what's supposed to go on with the afterlife that it's understandable.]
Souls that lingered too long in the Living World after death, corroded, and lost their hearts to despair. The process physically mutates them and they develop a hunger for other souls or spiritually powerful humans. [All boring business talk here.]
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Souls that lingered too long in the Living World after death, corroded, and lost their hearts to despair. The process physically mutates them and they develop a hunger for other souls or spiritually powerful humans. [All boring business talk here.]