[X] Go out in the simulated GranVang; it's low on power and limited in range, but it's absolute proof that you don't need the Getter Rays to overcome the legacy of the Custodians.
Wait a minute, you're looking at this all wrong. There's no reason to not just go out in the simulated GranVang right now. If it works out, great, you saved the day with your giant robot. If it doesn't work, you can transform on the spot and wreak havoc from there in your Symphogear. With that in mind, you immediately activate what little power the simulator has left and eject yourself from the Lombardia into the waiting hatch of the GranVang. While it would be nice if you had Photon Power to back up your simulation, you don't regret building bonds with your friends and teammates with that time instead. Speaking of your friends and teammates, there they are now! You're not quite sure how they're breathing in space; Elfnein explained it away as 'something something phonic gain' and you're inclined to believe her. It's not like it's any stranger than Ange being able to open up her cockpit and breathe in space.
Owing to your comparatively short range limitation, you find yourself forced to take up the position of rearguard as your friends charge in ahead of you. Fortunately, the GranVang's guns are enough to make up the difference, with your Positron Convergence Cannon in particular clearing out a small swathe of enemies before they can flank Chris. She acknowledges your assistance with a nod before firing off a Giga Zeppelin into a crowd of three-winged drones.
Your other friends have not been idle; combination attacks seem to be the order of the day as the wielders of S.O.N.G. show what they can do to the drones that stand in their path. Kirika and Shirabe fly in two different directions before glowing a bright green and pink respectively and smashing the drones in between them in a fiery crash your senses automatically label POI Style: Gliding Pincer. Four of Miku's smaller mirrors form a ring around her before she fires off a Jade Ring beam that not only destroys many drones, but also propels Hibiki forward, the latter's elbow rockets only adding to her momentum as she crashes into and then through several of the penguin-shaped machines that once gave you so much trouble. Finally, Tsubasa and Maria are far less flashy, but no less effective as their blades carve enormous swathes through the enemy hordes. Maria's smaller blades fly in every direction to cover Tsubasa's flanks as her two massive blades devastate the enemies before her. Chunks of metal debris fly everywhere as drones are destroyed left, right, and center; it seems like you'll have your hands full with orbital cleanup once the fight is over.
You promptly banish the thought of what may come later; from the looks of things, you've all got a long battle ahead of you. At the back of the pack, as you have come to expect by now, you spot Dawnbringer, its pilot no doubt waiting for an ideal opportunity to take you out. Unfortunately for R. Ishum, your android senses are every bit as keen as his; if he wants to ambush you, he'll be waiting a long time indeed. Instead of circling around each other endlessly, you opt to call him out directly.
"R. Ishum! You said to show you my resolve; here I am! Humanity doesn't want you or need you any longer; face me and see just how far we've come!" You challenge R. Ishum and he responds in kind.
"Very well then! Inheritor of the Anathema, I accept your challenge! Show me your strength!" His piece said, R. Ishum then charges directly at you, Dawnbringer going above and around your friends in order to bring its Inferno Blade down directly on your head. You maneuver away from his charge before retaliating with your Super Railguns and peppering Dawnbringer's frame with bullets, maiming and disabling its left hand in the process. His speed is superior to yours, but you have the advantage at range; more importantly, you have far more experience in actual combat. He's clearly spent the last thousand years sitting around on standby, while you've been fighting for your life across multiple dimensions; the end result is that his swings are telegraphed and his movements predictable. He's no rookie, but compared to an ace pilot of your caliber he just doesn't measure up. Unfortunately, a technological advantage can make up for many flaws, and in its current state the simulated GranVang just isn't up to the challenge. Even aside from the lack of power, this machine was always meant to be piloted by two, not one. As fast as your reactions are, they can't quite make up for the fact that you're doing twice as much work as you're used to without any additional processing power.
To make matters worse, R. Ishum apparently has a new trick up his sleeves; the next time Dawnbringer lights on fire, it stays on fire, even after you dodge his initial attack. However he's doing this, you can't get close without melting, nor can your bullets or Stun Shockers. The Positron Convergence Cannon remains a valid option, but that's about it; everything else is either too slow or reliant on solid ammunition that won't make it through the barrier of flames. The next few seconds are a desperate blur as you duck and dive to avoid Dawnbringer's flame barrier while blasting away with the Positron Cannon to the best of your ability. Fortunately, you're not alone, and Tsubasa's Blue Flash blasts one of Dawnbringer's wings, slowing it down and allowing you to get out of melee distance. You shout your thanks into the void as you level the Positron Cannon properly and fire.
You're immediately rewarded with the sound of the damaged wing exploding, but the time you spent lining up the shot costs you as R. Ishum closes the gap and nearly punches the cannon in half with a cry of "Plasma Knuckle!" The simulated GranVang's armor begins to bubble and buckle under the heat of the flame barrier; if you were human, you would be more than just uncomfortably warm right now.
"I'm disappointed, Nine!" R. Ishum promptly shouts over an open channel. "I told you to show me your determination, but your weapons are no match for the Last Light! Accept your defeat and I can make your death swift and painless; you have earned that much, at least!" So that's what he calls that barrier trick; regardless, you won't give in so easily.
"Like hell I will!" You snarl in reply. "Murasame Missile!" The missiles cook off almost instantly after launch, but in such close proximity the blast damages both the GranVang and the Dawnbringer equally; ordinarily not a trade you'd be willing to make, but under the circumstances it's ultimately to your advantage. You have a backup option, after all, and he doesn't. The missile launchers are now damaged beyond use, but you were able to cripple Dawnbringer's left arm and keep the hand from regenerating properly so you'll take that as a win.
"I didn't come all this way just to die!" You shout as you kick the Dawnbringer in the torso; GranVang's lower left leg is melted as a result, but it leaves a nice-looking dent in the cockpit armor to remember it by. "We'll beat you with or without the Getter Rays, because humanity doesn't need you anymore!" You follow up with a punch from your left arm, melting it into slag but splashing molten metal all over Dawnbringer's main cameras. "You can't build a future out of blind ignorance and fear; we won't allow it!" You then activate the Anti-Proton Smasher in the GranVang's torso; while it's too slow to actually hit Dawnbringer, it encourages R. Ishum to back up right into your discarded Super Railgun, the ammo promptly cooking off and physically pushing him back into the path of your blast. "Humanity has evolved past you, while you do nothing but wait and judge them from a place of ignorance and supposed superiority! I have my friends and my world to protect; you have nothing but pride and bloodstained dust! That's why your heart's not even in this fight! This is the power born from love!" Much of Dawnbringer's frontal armor is melted off now, the jagged black stretches marring the once-pristine silver frame.
"You dare call ME ignorant?!" R. Ishum screams as the flames of the Last Light lick at GranVang's remaining limbs. "You, who flirt with a power you can barely comprehend, much less control?!" The Inferno Blade promptly slices off the top of GranVang's head, but it'll take more than that to finish you. "If the Getter Rays are not stamped out here and now, there is no telling how much damage they could cause! For the sake of the entire universe, you must die!" From his perspective, it must look like he's about to get his wish; your friends are all too busy with swarms of drones to come to your aid, while the Lombardia would inevitably hit you as well should it fire into the melee your battle has become. Meanwhile, the GranVang is down both limbs on its left side, most of its weapons, and part of its head. While you've done more than your fair share of damage in return, it's clear that in the end your machine just couldn't keep up.
On the bright side, pun not intended, Dawnbringer's flames are flickering and fading; you can see clear gaps in its protective curtain. While you're no longer in the best position to properly take advantage of those gaps, they also mean that you now have additional options available to you. It's clear that the GranVang is on its last legs; all that remains is choosing what you want to do for its final action before you activate your Symphogear.
[] Switch to Final Buster Mode and use yourself as a projectile; it'll hurt, but it'll almost certainly get you well inside R. Ishum's guard. Plus there's no way he'll see such an insane stunt coming… right?
[] "Lombardia, fire on my machine!" If you use the GranVang itself as a bomb and punch out at the last second, the combined explosion of matter, antimatter, and Photon Power ought to put more than just a dent in Dawnbringer. Hopefully you can escape the blast radius in time…
[] Write-In; the crazier, the better!