Can't stop myself!! Leave me alone on my web tangent. I was hoping they were going to be the spiders that braided the beard. There is so much opportunity there. Lots of dwarves braid their beard. Having these spiders make "webs" out of their beard could be such and awesome thing to use!
Plot Hook: during a bawdy night at the local tavern (while off-duty), the local dwarven constable nods off briefly. He wakes to nothing amiss, other than a mild headache and a slight numb feeling on his chin, presumably from resting his head on the table for too long. He resumes duty, only to go into a coma a day later. The doctors who treated him think the coma was caused by bad alcohol and are ready to dismiss the case, but the constable's deputy is suspicious. In reality, someone took the constable's inebriation as an opportunity to plant a few cold forge spiders in his beard (which are decidedly more toxic). They look enough like beardspiders to the untrained eye, and have blended in with his colony. The constable will remain in a coma until the cold forge spiders are found and exterminated (the aggressive invaders bite him almost every day, keeping his system flooded with toxin).