Silicrons

The Silicrons are an artificial race of rock minions that can be created and destroyed at will by The Traveller. It uses them due to them being able to hide as regular rocks even going as far as being camouflaged if The Traveller creates them in the right color. The only thing that could give them away is the spiral energy output on their bodies. This can usually be hidden by the Silicrons lying down. They have "feet" that hold up their body via magnetic levitation which took a while for The Traveller to perfect and so old forms of the Silicrons were stationary and more like turrets than minions.