The Spirit Stones, Reiseki (spirit stone) in Japanese, are consumable items found in Fatal Frame. The stones are imbued with spiritual power that allows the player to use the Camera Obscura's Auxiliary Functions, including as Pressure, Slow and See. One spirit stone is consumed every time one of these functions are activated. Spirit stones are dropped by many ghosts and can be found scattered throughout the Himuro Mansion. The very first spirit stone is dropped by the ghost of Koji Ogata.