Turn Spectral Pages into Manifested Pages by defeating at least one Headless One and then completing the Haunted Sector.
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The energy unleashed by defeating Headless Ones is enough to turn your Spectral Pages into Manifested Pages. One Spectral Page is Manifested for each Headless One defeated.
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"Oh no. It's coming this way, Guardian. It's even scarier than in the stories! Tell me when it's gone!" —Glint, while hurriedly decompiling