Ennard: He also climbs in the vent system, but unlike the other animatronics in the vents, he is difficult to track, appearing only briefly here and there when moving. He can't be seen in the vent opening, but gives himself away by making a squeaking sound before attacking. Close the vent door on him to send him away.

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Ultimate Custom Night Animatronics Guide
FanfictionHere you can learn what every animatronic from Ultimate Custom Night do