Thraller

Thrallers were silicon-based parasites found primarily on the moon Skalle. Resembling long strands of dark-colored wax, they would attach themselves to nearby sentients and then they would begin dissolving the victim's skin, replacing the flesh with their own mass. Once the victim's flesh had been completely replaced, the thraller would use the victim to help it capture more victims. Meanwhile, it would slowly digest the victim from the inside out, in a process that kept the victim alive for decades. This behavior led xenobiologists to speculate that the Thraller was somehow related to the more sophisticated Sarlacc.