So, where, perchance, did the wizard get them in the first place? They make quite a brutal revenge weapon indeed.
A neat little critter - the cocoon - spun stone - sounds like it could be used as asbestos, already formed into sheets. This alone could be worth adventuring for.
Not enough for a full adventure, in my opinion, but well fleshed out, very detailed and would make for a very interesting side quest. I'm sure a nearby mage would pay good money to get a glimpse at such an interesting phenomenon, or at least a piece of it's stone incubator.
Plots (Nature) (Single-Storyline)
*evil GM grin*
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