Not a spacecraft, strictly speaking, but then neither is the Lexx. This was the giant body that His Divine Shadow grew for himself over thousands of years. It's appearance was identical to the race of insects that His Shadow had once belonged to, although it was a hell of a lot bigger. It was destroyed when a baby cluster lizard ate its brain and it fell into the first fractal core.

The Gigashadow is the last fully grown denizen of the long-lost Insect Civilization, in the sci-fi television series LEXX.