Gone but Not Forgotten
Turn Spectral Pages into Manifested Pages by defeating at least one Headless One and then completing the Haunted Sector.
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.
"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