Trait: We never die

Many of the members of the Chapter have some physical mutation that makes them exceedingly difficult to kill. Any Command Squad (not terminator) Independent character not on a Bike or in Terminator Armor, Veteran squad, and Sergeants gain +1 toughness for +7pts.

Pretty much as it is stated in the trait itself, I designed this trait to represent a chapter with an unusually thick bone structure or other similar trait. Perhaps the chapter found some form of metal that their artificers are now using in their armor that's stronger or denser then adamantium.