If you are looking for an unstoppable army of killing machines unhampered by such weaknesses as mercy and compassion, robot warriors are for you. These metallic automatons will serve you without question, destroying your foes with their ray guns. They are also remarkable resilient, able to take an amazing amount of damage before finally being blown to pieces.
A variety of forms are available, such as humanoid, tank-shaped and fifty-story-high monstrosities beyond all comprehension.
— Neil Zawacki, How to Be a Villain