- Marsh's notebook contains notes on Hemalurgy. Death is giving away a necronomicon!
- Nightmare Retardant in that is heavily implied Marsh has been guarding this book for quite some time, until its knowledge would be necessary. The real nightmare fuel is that Spook considered Hemalurgy useful enough to be worth preserving, and wrote down everything he knew about it. He even goes so far as to say Hemalurgy must be good now, because it's part of Sazed's powers. Was dear, friendly Spook experimenting with the setting's Blood Magic after we left him at the end of Hero of Ages?
Nightmare Fuel / Shadows of Self