GM Core Rulebook - Pocket Edition Pathfinder 2nd ed

Pathfinder 2nd edition is a fantasy role-playing game, and the GM Core is a primer for the game that covers everything the game master needs to know to create exciting adventures, build fantastic worlds, make the most of the rules system, and create dramatic battles.

Pathfinder 2nd edition: GM Core - Pocket Edition contains

Guide to creating Hazards, Monsters and Encounters
Magical treasures, potions and enchanted weapons and more
Tools to create better RPGs and become a better GM
Variant rules and subsystems for different situations
Core GM - Pocket Edition is compatible with both older and newer Pathfinder 2nd edition material. The book replaces the Pathfinder 2nd: Core Rulebook and incorporates updates and corrections from the first four years of Pathfinder 2nd edition and includes some of the most popular additions to Pathfinder.

The Pocket Edition is a smaller and more compact version of the rulebook, which is easier to take with you on the go.