Pathfinder GM Core includes:

• The rules needed to run a game of Pathfinder, including guidelines for creating challenging encounters, determining success, and giving out rewards.
• Advice aimed at making you an incredible Game Master, along with tools to ensure you and everyone else at your table has a safe and enjoyable experience.
• Guidelines to help you create your own content, from campaigns and adventures to hazards and monsters.
• Rules subsystems to help you handle a wide array of game situations, including rules for chases, duels, research, infiltration, and more!
• A guide to the world of Lost Omens, with a look at several important regions, an examination of the peoples and cultures of the world, and a glimpse into what lies beyond the veil of the universe!
• Fully integrated errata from the first 4 years of Pathfinder Second Edition, including improvements to staves and talismans and all-new apex magic items!
• Published under the new Open RPG Creative (ORC) license, giving players and Game Masters even more freedom for making their own creations based on Pathfinder Second Edition.