
RedDingo |
I don't know maybe calculate the hardness and hp of bone (similar to steel) and use that as the damage threshold. Then translate a successful injury to ability damage or penalties to ability based checks based on the location of the injury.
Leg - penalty to movement speed (halved), touch AC and skill checks that require legs and balances. There's also a penalty to melee and ranged attack rolls. As a move action, you can make an acrobatics check to make a ranged attack without penalty.
Maybe something like that.