I always wanted to do a line based on simple machines, so I revisited the concept with scorpions in mind. I might come back one day to redraw the last stage, even if I don't redesign it too much.
Simple machines can change the direction or strength of a force. Of the 6 established machines, there is the inclined plane which is basically a ramp. The inclination of the ground (a plane in math refers to a 2D space) helps redirect horizontal force into some vertical force as well, lifting an object. The wedge is another simple machine but it functions like an inclined plane that can move. Wedges are like axes which move forwards to move incoming material towards the sides. The screw is another simple machine that rotates to move forward or backward. Screws are like the side of an inclined plane (triangle) wrapped around a pole.
Rampling (Steel/Ground): They are designed to scuttle forwards quickly even if they are underground as the ground is lifted up and over the body. When in danger, Ramplings can use their tail like a lever to throw some dirt at their opponent.
Araxenid (Steel/Ground): One can see the top of an Araxenid's armor cutting through the ground as they run just below the surface. Araxenid's claws allow them to dig into the ground of their natural habitat and sneak up on their prey.
Scrupion (Steel/Ground): Scrupions are rare to find out in the wild as they pop out and back into the ground at a blink of an eye. Scrupions can spin their hands and tail's end all the way around, allowing them to drill into any obstacle they face.