Pathfinder RPG: Player Core 2 (P2)

The Game Master’s Handbook of Proactive Roleplaying: Guidelines and strategies for running PC-driven narratives in 5E adventures (The Game Master Series)

The Game Master's Book of Astonishing Random Tables: 300+ Unique Roll Tables to Enhance Your Worldbuilding, Storytelling, Locations, Magic and More ... RPG Adventures (The Game Master Series)

The Game Master’s Book of Villains, Minions and Their Tactics: Epic new antagonists for your PCs, plus new minions, fighting tactics, and guidelines ... RPG adventures (The Game Master Series)

The Game Master's Book of Legendary Dragons: Epic new dragons, dragon-kin and monsters, plus dragon cults, classes, combat and magic for 5th Edition RPG adventures (The Game Master Series)

Pathfinder RPG: Pathfinder Player Core (P2)

The Game Master's Book of Non-Player Characters: 500+ unique bartenders, brawlers, mages, merchants, royals, rogues, sages, sailors, warriors, weirdos ... RPG adventures (The Game Master Series)

The Game Master's Book of Traps, Puzzles and Dungeons: A punishing collection of bone-crunching contraptions, brain-teasing riddles and ... RPG adventures (The Game Master Series)

So You Want To Be A Game Master: Everything You Need to Start Your Tabletop Adventure for Dungeons and Dragons, Pathfinder, and Other Systems

The Game Master's Book of Random Encounters: 500+ customizable maps, tables and story hooks to create 5th edition adventures on demand (The Game Master Series)