Li Shenron said:
Eventually the only things coming to mind involve modifying the variant itself, which I think you don't want to do.
I've already done so-- it was modified before I even started the game, and I've modified it again.
Thanks for all your help, all of you. I think I've got it.
First, I'm using a modified form of the variant, in which the Armor's value is halved (round up) to determine DR value, and then provides no AC bonus. Natural armor functions the same way, but humanoids (by shape, not type) have reduced DR values (1/- DR for 1 natural armor bonus, then +1/- for every three full points), while non-humanoids calculate armor the same way.
Certain weapons have the trait "Armor Piercing", which halves the DR granted by armor or natural armor.
Adamantine weapons ignore non-adamantine armor (including natural armor). Adamantine armor protects against adamatine weapons and non-adamantine Armor Piercing weapons.
Players may choose to make a Called Shot, at -4, in order to disregard armor. This does not work against natural armor.