The creatures always had warnings and stories about the tunnel network that populated the underground territories of the planet. Legends of cities, entire civilizations, that were not capable of living with the contaminated surface, full of dying creatures and fainting technology.
These stories also spoke of the frightening and deadly mechanized guardians that protected the entrances to these tunnels.
They never rest, they never cease on their duties. An almost perfect power supply keeps them operational and ready to terminate all the intruders.
Come close enough and the last thing you will see is the blue glow of their lifeless eyes.
Modelling, texturing, character rigging and all that horrible stuff plus the raw render were done in 3dsMAX 9.0 using SSE mode and regular reflections. Final compositing and fluff with Photoshop CS3.