The Twisted Animatronics

The Twisted Animatronics are a special kind of animatronic designed by William Afton (The Silver Eyes). They would hide underground, and come out of night to capture victims, keeping them inside, and waiting for a Springlock Failure. They were later destroyed during the events of The Twisted Ones. They can actually be controlled by William Afton.

They also can create so much stimuli as to overload an opponents' mind, causing them to see things that are not really there, as it tries to fill the gaps. Hence, it creates illusions.

In the ETQAY saga, after William's return, he and other Nightmares began a quest to find the pieces to rebuild them. The parts were indeed found, but we're not sure if they were ever reconstructed.