Revised Uses for Occult and Cthulhu Mythos Skills in Call of Cthulhu

For Call of Cthulhu, 5th edition: clarifications of how the Occult and Cthulhu Mythos skills are distinct; some new uses for the Occult skill; new uses for the Cthulhu Mythos skill; and new rules for studying from Mythos books, including the use of "clues," a concept from the Arkham Horror board game adapted to the role-playing game.

Occult and Cthulhu Mythos in 5th edition CoC