Reality has fractured. Across the world, the boundaries between planes have torn open, spilling entire ecosystems of monsters into the material realm. Rivers of infernal fire carve through the land. Ancient forests twist into savage wilderness. Drowned horrors rise from the crushing depths of alien oceans. Storm-charged skies shatter above floating islands of lightning and wind. Planar Breach is a bestiary and encounter toolkit designed to help Dungeon Masters unleash truly mythic threats at the table. Inside this compendium you will find: • 75+ original monsters across five distinct planar ecosystems • Tiered creature design ranging from low-level threats to world-ending entities • Unique monster traits, abilities, and tactical guidance for running memorable encounters • Legendary creatures capable of reshaping entire campaigns • A fully realized planar collision setting where five realms violently overlap Each creature is built to be immediately usable at the table, with clear stat blocks, encounter roles, and DM tactics that help bring battles to life. Whether you are searching for a single terrifying monster or an entire region filled with new threats, Planar Breach provides the tools to make your world feel dangerous, alive, and mythic. The breach has opened. What emerges next is up to you.