Brank (You have revealed the first secret)
Gravimetric Movement: Every three turns, the Great Future charges up its concentric rings of advanced Alcubierre Drives for movement, as it lacks any form of meaningful thruster-based movement. Immediately, it can move at enormous speeds and change its position translating itself in realspace with careful Metric-Tensor manipulation. Doing so creates enormous gravitational ripples in its wake.
The great future's form, to the fleets that target it, simply elongates and snap back far away from harm's way, the bombardment strikes out the gravitational waves left in the wake of the behemoth, who moves faster for a split second than any fighter could hope for, leaving its "engines" at a momentary cooldown.
The shields follow wake in the operation, being dragged and leaving a large cloud, like a puff of smoke, of plasma as they did so due to the incalculable swerving of the fluid dynamics of plasma. Then, two things happen: First, Interdiction is activated, a massive and powerful sphere of influence is projected from the interior of the Capital ship, securing the fleets into combat.
Then, the three shots that the Great Future fired suddenly spring into motion, releasing enormous ammounts of sensory information from far away. They weren't warning shots, they were Flares. Interferometry data comes towards the massive ship, which integrates and accounts for all signals within the system.
The second alarm that came was from the sensors of the Great Future, they were there gathering data from the dimensional collapse of The Anvil, as the star's energy was slowly seeped and fed back into itself. The megastructure buckled under the nearby gravitational waves, large chunks of metal, varying from a few hundred meters to tens of kilometers, snapped away from the sides of the destroyed monstrosity, where more streams of light poured through.
The spinal weapons of the capital ship screamed as projectiles left them, the 8 concentric rings with the gravimetric catapults launched Scattershot missiles, relativistically cruising space before exploding into thousands of small pyramids of metal no larger than 10cm across, but with speed to compensate.
The Sandblasters (not the big one) also fired, focused on the largest weapons of the now enemy fleet, a stream of buckyballs were unleashed towards them, on impact, they became the hardest substance known to modern mankind, hyperdiamonds, with the capacity to eat through the hardest of armors with their extreme resilience.
The AP systems kicked into gear, watching out for any incoming ships. Though only 1/3 of the Modules were defensive in nature, that was still over 3000 defensive modules. Ranks of Swarm missiles, Degradation cannons, Polarizing beams and autoloading cannons traced the incoming forces, awaiting them to encroach on the ship to saturate space around it with extreme ammounts of fire.
The ship was now in the same level as the bombarding units and farther away than before, facing the fleet as a whole with its parabolic shielding.