The Shadows were the main villain of the Babylon 5 tv series. With their creepy as all hell ships, the aliens from Z’ha’dum were a force to be feared and reckoned with.
With this website I recently discovered, called Sketchfab, you can actually tumble through a 3D model of the spider-like ship itself.
Go into fullscreen mode and have a look. It’s kinda creepy and cool all at the same time.