Massive Death-Star-sized planet-vaporizing space station. Equipped with several fun and useful ways to kill an entire world's population inside a comfortable cigarette-break time limit. It would be self-sustaining, capable of supporting its large human crew and even larger automated staff. It would be circular and styled kind of like a giant doom onion, with several autonomous self-shielded layers, so that when one bit is destroyed or damaged beyond repair we can jettison the rogue part and then take potshots at it for fun.
It would be named Subtlety.
It would be named Subtlety.