A lot of us probably think scars and stuff are pretty badass, and it shows that you've had experience in battle. If that is the case, such things should be pretty hard to unlock as a customization, to show that you didn't just put a scar there to feel cool. In Skyrim, there are all these scars but I don't have any meaning or story behind them. It's for looks. What if there is a story behind it? What if unlocking damage customization required an experience that almost led to your own death? Here is what I had in mind: Scars and stuff can be unlocked through certain achievements, but can also be unlocked by having "close calls" with enemy encounters. If you and a Chaos Boy go at it, and the battle leave you severely wounded by still standing, you unlock one scar that you can place somewhere on your armor (the kind of scar depends on the weapon used, which I will get to in a sec). You can unlock one scar every five or ten levels gained, so that you can't just get a hundred scars early on in progression. Same goes with burns or other armor damage. You unlock certain scars depending on what weapon is used. A Deep Gash scar, which is deeper and kinda jagged, can be unlocked by having a close encounter with one with a power axe. Or a Clean Slash can be unlocked by one with a power sword. So on and so forth, use the imagination. The scars can be customized (to a reasonable extent) to determine how wide or long it can be, and you can place the scar anywhere on the body. Think of it like making a line in a photoshop program or paint; you click the point you want the scar to start and move it around in any direction you want it to be. If you wanna scar across a Space Marine's body armor, you click at one end of the armor, move it to the ending point, and click again. Then, you can manipulate the scar as you wish. The scar will be modified depending on what surface it goes over. So, if you want five scars going every which direction on your body armor, you can do that. If you want a scar on your face, you can do that. If you want a scar on your head, you can do that. Foot? Yes. Back? Yes. Legs? Yes. Wanna scar that transitions from your cheek down to your chest armor? Sure. I don't know if this kind of thing has been implemented in other games, but I think this should be taken into consideration.