The Book of Unremitting Horror (Gumshoe Version) (1e)
Players in horror campaigns are a little too accustomed to the nightmares their characters face; even the most eldritch of tentacular horrors is less intimidating when you know exactly what it is¸ because your PC has faced it before.
"New times demand new nightmares. This¸ therefore¸ is a book of horrors¸ not a manual of monsters. The horrors are nightmarishly intimate¸ often created from human vice¸ or let loose by human greed. They show us the ugliness that underlies reality. They are the crawling things under the rock of the everyday¸ sane world. Consequently¸ we've detailed our creatures in depth.
"Each one has its own agenda¸ its own reason for existence and its own legend. We've made these creatures unusual¸ frightening and bizarre¸ yet sufficiently comprehensible that they players realize they are up against something intelligent¸ if inhuman.