Coming to consciousness, you realize one thing: you were in the midst of space in an area filled with hundreds, if not thousands of dead, unmoving Grineer ships. similar to a ship cemetery. With a gigantic lich ship sat dead in the midst of the destruction.
When you open your 'eyes', your Warframe body stood, or rather floated amidst the destruction. Your prime body gleaming from the lights coming from a near by star. Your default silver color ripping on your body as it comes to a stop. Your memories come back.
After you were made, hundreds of thousands of years after the old war. Your form composed of millions of nanobots which makes up the entirety of your frame. The silver harden substance which was goo-like is the nano's solidifying from the liquid state when you body came to.
You remember how you just destoryed this Grineer fleet. Your nano's devouring ships and thousands of Grineer at a single time even. Reproducing and expand further and further and further. Your form killing and/or absorbing everything you touched with even a single nano being able to murder several Grineer, this is how you won, 1 v 1000's.
As you look down, you see a planet beneath you. Splotches of white, green, blue and many other colors makes up the current surface of the planet that you could see; the Grineer were definitely going to invade this planet, with it being saved by your awakening. Whether or not youre the hero of the story, or the one who'll devour planets as a sole sentient Warframe is up to your discretion, or going to loot the grineers ships and man them as a single hive mind army and take their body's with your nanobots.