A "gun with one bullet" which appears at the end of FAITH. It can be used to shoot either Amy Martin, a defiled fox corpse, a deer, the mysterious gray man, or Michael Davies. Whichever one is chosen will result in a different ending for the game.
FAITH: Deluxe Edition
The rifle can instead be used to shoot the mirror upstairs in the Martin house. It will require the player to go back and forth between where the gun spawns and the mirror so that it can be used multiple times. Eventually, the mirror will shatter and a demon hand will pull the player in, triggering a secret boss fight. The boss fight will produce a secret lore note but will not affect or change the ending in any way. After the fight is complete, John will respawn downstairs with the gun and the game will proceed like normal with the player deciding who to shoot with the gun.