Armor spikes are also a great primary weapon if you are utilizing a lot of natural weapons. Remember, if you are attacking with a manufactured weapon AND natural weapons, you get all of your iterative attacks PLUS all of your secondary natural weapon attacks (primary natural attacks are converted to secondary in the presence of a weapon that can make iterative attacks). The great thing about armor spikes is that they don't interfere with any natual attacks. If you were holding a sword, you couldn't also claw or slam with that limb. If you have armor spikes, nothing inhibits you from using them AND your natural weapons. Great for web enhacement Kobolds, Totemists, and anyone else relying heavily on natural attacks, especially claws.
As far as descriptions, I like the idea of backward facing razor barbs on the outside of the vambraces similar to Shredder from TMNT, along with shoulder and knee spikes.
