Each ship was shaped like an egg and was approximately eight thousand meters long, dwarfing most ships in the Galactic Alliance's arsenal. Their hulls were covered with blocks of spitcrete that served as primitive heat sinks.
Along with thousands of dartships, the Killiks managed to get several nest ships past the blockade, and even captured the Victory-class Star Destroyer Admiral Ackbar, the flagship of Nek Bwua'tu. This act, along with the escape of several of the ships, began the Swarm War.
Four of the ships were later seen at the Battle of Tenupe.