Save USD$20 on the Keeper Rulebook at Roll20! The Call of Cthulhu Keeper Rulebook for Roll20 is now available at a discounted price of $29.99, reduced from $49.99. It contains the core rules, background, guidance, spells, and monsters of Call of Cthulhu. Plus two scenarios. https://marketplace.roll20.net/browse/bundle/4536/call-of-cthulhu-keeper-rulebook