Mary Skelter: Nightmares Wiki
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A witchcraft core is a fully developed core, which is created by having a jail tower grow enough to reach the dome above it, letting the male and female cores fuse. The male variant is the regular core that the blood maidens seek to destroy and the female variant is sitting at the top of the dome. A witchcraft core is more powerful than a regular core and can grant wishes, such as Otsuu's wish to bring back Little Mermaid and co. Witchcraft cores were also the reason behind the war that waged on the surface.

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