Ple-Sen
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— Actually, everything is very simple and straightforward. This doll contains both the soul and the body of the unfortunate person, so if you swap them with someone else, she will be freed along with her physical form, while the soul and body of the substitute will be trapped inside the doll.
1. Find an apostle.
2. Swap places with Sonata.
3. Hide the doll somewhere far away.