The Undying is one of the tertiary antagonists of in Five Nights at Treasure Island: Found. He is a male slick, red-colored, humanoid figure in the shape of a lithe humanoid. During the second half of Night 3, an event surrounding Pirate Caverns will occur. During this event, Undying shows up in a cage on the bottom floor of these caverns after entering an elevator. He will also start in the Meat Freezer on Night 4.
Undying is a slick, red-colored figure in the form of a very tall, slender, humanoid-like being with very little face details, long fingers, and no eyes.
Undying starts out in his own room in a cage at the back, which is found on the bottom floor of the caverns. He then comes out of the cage and stares at the player while bending down. Like The Face he will chase the player throughout the whole floor. In Night 4, Undying will start in the Meat Freezer and if he is not watched, he will appear at the right door of the Office blinking the lights, the player must turn off the power or Undying will attack the player, as shutting off a camera or hiding under the desk will not work on him.