I'm DMing a group right now that likes to make stuff out of every dead beast they find. And I'm down with that and all but, one of them wants to make purple worm skin armor and said it would make him +18 armor. I don't think that is right. Can someone point out in one the books rules for this kind of stuff. Or maybe a good file on the web. Even a book if I have to get it that might make more sense out of making stuff. I'm very confused on this subject, so any help is welcomed.
Also of note for people who like to check this kind of stuff out my group started a blog of us talking about our game. We thought it would be an interesting way to give feedback to each other. There isn't much now but hopefully soon their will more.http://www.popanime.net/dork/