How did Chichi get the spell she used on Black Hat?

Chichi tells the others how she got the spell she used on Black Hat. She says that her mother knew Sunny's grandmother, but not well. Sunny's grandmother visited Chichi's mother in a vision the night before and gave her the juju that Chichi's mother gave her. Chichi's mother called it a "bring back" (331). It can only be created by powerful scholars. After they died, they bring it back to someone living and whoever the juju is worked on will have his worst sins brought back to him