A molleung worm was a Yuuzhan Vong bio-creation that was used as a cofferdam in both space and underwater. In the atmosphere, the worm released cargo from a transport ship to an on-world complex. In the water, the worm was used to link underwater chambers together. It is often used to attack troops prior to the landing of the transport. It can also assist troops in battle.
- The New Jedi Order: Balance Point (First appearance)