Pathfinder 2E: Dark Archive

From the fringes, the unknown beckons. Pathfinder Dark Archive contains secrets that any player or GM can use to reveal the paranormal lurking in their Pathfinder games! This spine-tinglingly secretive 224-page hardcover rulebook presents two new character classes perfect for delving into the unexplained: Unleash the untold power of your mind as the psychic or leverage supernatural secrets and mystic implements as the thaumaturge!

224 page hard cover.  Paizo