Resist
Both creatures and armour can have resistance to cold, heat, electric, radiative, corrosive, force, pierce or slash damage types.
Creatures covered in tough scales are often afforded slash and pierce resistance. Creatures that are covered in a carapace can have force resistance as well.
Regardless of damage type, resistance acts to reduce the damage you would otherwise suffer. If you wear armour that affords 2(resist,prc), and the attack does 14(hp,prc), then you can subtract 2 points, because of that armour, and suffer only 12 points as a result.
If your armour cannot protect you from a particular damage type, then you cannot subtract anything from the damage. For example most armour does not protect against radiative damage. So if that attack was 14(hp,rad) and your armour has no radiative listing, or is listed as 0(resist,rad), that is, no radiative resistance at all, then you would still suffer the full 14 points.
This resistance usually protects you from field damage as well, with the same effect. For example, if you are caught within a 8(field,cold) and you are wearing an aegis suit with 5(field,cold), then you will only suffer 3(field,cold) in health damage.
Resist Applies to The Thing its Protecting as Well as Itself
Armour, for example, is subject to damage just like the occupant is. Most of the time, we don't count the damage to the armour, but in some cases, it is useful to do so.
If we are including armour damage, we say that resistance applies to the armour itself as well as the creature that its protecting.
Lets take some combat armour which has the traits:
- size of 4 and a hardness (H) of 3, and therefore an HX of 12, and
- has a Health skill of 5.
According to the hp,max calculator
hp,max = HX • (1 + M(Health))
The armour should have 60 hp. Let's say that it has 4(rst,prc) and a bullet from a ds assault rifle is going to do 12 points of damage. With the 4(rst,prc), we can see that the armour and the occupant each take 8(hp,prc) damage.
Given that the armour, usually has a lot more hp than the occupant, the damage on the armour is generally a lot less.
If the armour's hardness trait is 2 or higher, it will always have frc, prc and sls resistance at equal to the hardness number at the least.
In fact the armour's hardness (H) is a muliplier to its own frc, prc and sls resistance. Therefore for the purposes of damage to the armour itself, the armour has 12(rst,prc), which means in this case, the armour takes no damage at all. Although its occupant still takes 8 points of damage.