These are constructs made by Fardinald Ertinfert. In Episode 4:Ride the Lightning, in the Lodestar in the Sky, the group gets an up close and personal look at these creations. They are squat little robot automatons standing 5 feet tall, that move here and there performing menial tasks. They have clockwork mechanisms and are humanoid in shape. They are confined to the floor they originate on and have a self destruct feature. The self destruct ability is easy to identify, it is proceeded by a series of beeps that become increasingly faster before the Robit explodes causing damage to anything within a 10 foot radius.
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