Before I get to that a little background. I had experiment with weapons and damage types in the past and the result was a bit overly complicated for my tastes (although the actual blog post is a lot more thought out and less rushed than this one!) What I'm proposing here is a lot more simple in its execution which in turn means the differentiation between different weapons will not be accurately represented. But that's ok, we can address that with weapons, this is about damage types and for these purposes we will be organizing all weapons into dealing damage in three different types. The damage type system and specifically this type, Impact, is related to how I run armor in my games which coincidentally is my first post in the A to Z Challenge. It is also directly related to Wounds which I've spoken about many times in the past. To sum it up quickly, Wounds are literally your character's lifeblood. If we think of Hit Points as a flesh wound or a bruised rib then we think of a Wound(s) as being clubbed square in the jaw. Here is how Impact damage interfaces with Armor and Wounds.
Impact is for weapons whose goal is to transmit their full force through a single swing. Typically, the weight of the weapon will be concentrated in its head delivering the maximum force in one concentrated area as opposed to a cutting weapon which whose force is transmitted along the entire length of the blade. A fist, mace, hammer, flail or even an axe would fit into the Impact category.
For each Wound converted to Subdual damage the weapon deals an additional Wound, the total extra Wounds dealt cannot exceed its Impact rating.
Impact weapons, especially flanged maces and hammers, rose to prominence with the advent of plate mail as they were quite capable of wounding the person underneath the metal. When I thought about designing an Impact weapon I wanted it to be a weapon whose primary usage was to take down armored foes. With this implementation it becomes a threat to any armor wearer. Any given weapon can have an Impact rating of 1-3, those with the highest rating are more than capable of injuring someone with plate mail. If you recall plate mail reduces all damage by 3 and coverts any Wounds into subdual damage into subdual, a weapon with an impact rating of 3 would deal 3 additional Wounds on top of this. Even a weapon with only a rating of 1 will rack up subdual damage at an elevated pace. Overall I'm quite happy with how it turned out and it has been the most stable of the three damage types.
The next two damage types will be S and T.