Rules reference
How progression works and how to track it. Call of Cthulhu 7th Edition is a horror investigation roleplaying game based on H.P. Lovecraft's Cthulhu Mythos. Players take on the roles of Investigators—ordinary people who uncover cosmic horrors beyond human comprehension. As you investigate mysteries, your character's Sanity slowly erodes, skills improve through use, and the line between reality and madness blurs.
Call of Cthulhu advancement is a loop: use skills → mark them → roll to improve after sessions.
After the session, roll to improve the skills you actually used. Your investigator gets better where the story pushed them.
Progress isn’t only skills: track Sanity consequences and long-term effects as part of the campaign’s arc.