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Here's some datapoints, will add as I encounter this room more
- Nightmares -1 CP (to exactly 4 levels), Wounds -1 CP, Noises in the Library -1 CP [finding book]
- Nightmares -1 CP (below 4), Wounds -1 CP, Noises in the library -? CP (probably 1 but unsure exactly) [finding room]