Giant Spaceship

The giant spaceship was the headquarters and mode of transportation of the Dark Matter Thieves. The ship possessed incredible firepower, capable of destroying the majority of A-City in an instant. It crashed after Saitama shattered the Power Core, its source of power. The ship's parts were salvaged by Metal Knight.

Appearance
In the manga and anime, the ship is shaped like a tooth. In the manga, the ship is colored Steel Black, in the anime it is Purple. The ship was massive in size; it was large enough to cast a shadow over the majority of A-City and was able to destroy 99.8% of the city with a single shell bombardment directed downward.

Trivia

 * In chapter 33 of the manga, Saitama is seen walking through an incredibly detailed section of the spaceship. The drawing used as the map here is called "Papa's Maze", an incredibly detailed labyrinth created by Kazuo Nomura.