Dreadnought

The feared Dreadnought-class warpship is capable of ruining whole planets (You'd expect any galactic scale arena to have a few of these, right?) through its atmosphere deprivation dish. It also has a few auxiliary weapons, all of which pale in comparison with its primary weapon (which can't be used to defend itself). The dish is very fragile and thus an invading fleet will generally have to be able to establish space superiority in the vicinity of the dreadnought.