Big Gun? No. BIGGER GUN? Yes. My first move is a custom built frigate, named the DUSK OF NOVEMBER. This frigate is the largest frigate in the unsc military (of course smaller than the Spirit of Fire and Infinity) and is the first ever Achilles-class frigate in the fleet, armed with multiple hannibal-round defense turrets and an extremely powerful MAC cannon. (Not canon to Halo universe, but it will be canon in my upcoming halo mega bloks animation series)