Detectors, also known as Sinister Quagmires, are Twisted from The 3rd Birthday. Detectors look almost exactly like Rovers from the top part up. Detectors don't show the bottom part of itself as it's in a different dimension. Detectors main purpose is to detect and search out people. If Aya is spotted by the Detectors, they automatically disappear and a Rover takes its place. Even using weapons that may touch the Detectors will also alert the Rovers.
Appearing as if bubbling up from the earth, this Twisted work only in tandem with a Rover, acting as kind of an alarm system. It has no attack capabilities and disappears the moment it spots an enemy.
Attack it with a grenade or grenade launcher to send it packing - but not before it sends in its friend the Rover, ready to eliminate any intruders.