Undying

The Undying is a male slick, red figure in the shape of a humanoid in Five Nights at Treasure Island During the second half of Night 4 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 5.

Appearance
Undying is a red-colored figure in the form of a very tall, humanoid-like being with very little face details and no eyes.

Night 4
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.

Five Nights at Treasure Island
in Night 5, 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, as shutting off a camera or hiding under the desk will not work on him.

Five Nights at Treasure Island
Undying will start in the Meat Freezer and if not watched, he will move to the Office.

Night 4
in Pirate Caverns he will start inside of a cage and then will chase the player for all the second floor.

Trivia

 * Undying cannot chase the player on the first floor from the Pirate Caverns