The Lost Omens Monsters of Myth setting book details 20 monsters from the Inner Sea region and beyond. It features an array Golarion's monsters including the Sandpoint Devil, Fafnheir, the Father of All Linnorms, and more. This book also includes rumors, tales, and treasures for gamemasters to use in plot hooks and encounters.
Pathfinder Lost Omens Monsters of Myth will retail for $34.99.
Also, Pathfinder Book of the Dead, a new rulebook for Pathfinder 2E, will hit retail in spring 2022 (see "The Dead Rise in 'Pathfinder 2E'").