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We've given the Emperor and the Imperium everything. We've built up Lucius as its war machine. We chose to let a different brother manage it to detract from Horus forces, rather than handle it ourselves, so that we could come here to Sol and prevent a disaster from Mars opening the door to Terra. We could've chosen to stay on Lucius, defend Hearth and Home, Wife and Parents, our Empire.
We chose to come here. And we've done all we can to shore up Terra. Even at the cost of Mars itself.
The very least thing the Emperor and Malcador can do is not begrudge us if we choose survival as our main imperative. We can fight the Long War if we survive. Not even the loss of the Astronomican will destroy the Federation, for the Void Dragon knows other ways to guide through the Warp.
In between the Lucian Tech and Necron Teleport tech we are the master teleporter. Maybe we can make the excuse that if we stay on the Imperial Palace in the throne room, we can stop the Dark Gods from interfering with their jump onto the Vengeful Spirit. Someone had to stay behind on Terra to defend, and that was Khan who is dead. We could replace him.
I hope as a C'tan Shard we have what amounts to Necron Reanimation Protocols. The one where if we sustain serious damage, we are teleported elsewhere to repair (probably the Noctis Labrynth).