Munificent-class ship that sort of looks like a gun

The Munificent-class ship that sort of looks like a gun was a massive frigate used by the InterGalactic Banking Clan. They never found any lifeforms of sufficient size to wield and shoot Munificent-class star frigates, but they figured it'd be really, really cool if they could.

The frigate also acted as a triple-changer: it could transform into a robot and something that kind of looked like a tank with treads that didn't work. A typical frigate carried a crew of 150,000 battle droids... roughly 30,000 of which were crushed when the ship transformed.