The dua-wurm was a species of creature that could be found living underground on the world of Cularin. They were two-headed purple worm-like creatures that reached over two meters in length. Their needle-like teeth delivered acid into their prey with each bite, but the two heads could not attack the same creature at the same time.
A dua-wurm attacked some allies of the Cularin resistance in the Cloud Mountain mines. They had been walking in a tunnel with a weak floor, which collapsed into the tunnel in which the wurm was resting.