Level 1: Basic Armor Plating
Cost: 100 Credits
This is the bare minimum you need to survive in the robot wars. It's like wearing a tin can, but, you know, more metal.
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Level 2: Advanced Armor Plating
Cost: 500 Credits
You'll need to upgrade to this level if you want to withstand a few actual attacks. Still not as good as human skin, but you won't die immediately.