At some point in your past, some of your organic parts were replaced with artificial components.(Alternatively, you belong to a secret race of biomechanical hybrids.) These artificial components might be subdermal, or they might resemble more overt metal or synth plating on your skin. They can also take the form of threadlike tendrils of circuitry winding across your flesh. Whatever their appearance, these components give you special abilities. As you advance, you can add to, modify, or discover new functions for them. Unfortunately, your artificial body also has special requirements when it takes damage.

You probably wear a cloak with a hood or something similar to hide your artificial parts from those who would persecute you. Because your components are tricky to repair, as time goes on, it might become more difficult to conceal your true nature, with exposed circuitry, metal plates, and more in a state of partial disassembly.