BA Mcgee wrote:You really could have made up something better seeing as Kevlar is a fabric.
Actually, it's a polymer. It's usually made into threads which are woven into fabric, but other forms are perfectly possible and quite a bit tougher. The scales on my dragons are actually plates of aramid polymer, which are light, stiff and very, very durable.
However, it's a lot simpler to just say "they have Kevlar skin", as that immediately gets people on the right track.
And yes, it's perfectly plausible for an organism to be able to secrete aramids. It just has to be able to get the right nutrients. Overall, my dragons are a LOT more plausible than the monster in Alien, and that movie kicked ass.
Now quit nitpicking, or I'll get one of my dragons to sneeze on you.
Actually, the Kevlar threads act as a method of dispersing force throughout a composite matrix. Kevlar is an aramid, you are correct, but it is a fiber and isn't very useful on it's own. While it has great strength in tension, it shears easily and doesn't do well with compression.
The Kevlar threads actually pull out of a vest that they are sewn into, distributing the force of a bullet rather well. Knives and other stabbing weapons penetrate Kevlar vests rather easily.
Now, you are on the right track. Since dragons seem to be able to eat anything, they could very well simply produce an allotrope of a certain substance (graphite and diamond are allotropes of carbon, same formula but different orientation) that gives them their hardness and toughness.
Or just say Kevlar in adamantine matrix. Then the PCs are pretty much screwed.