An MLP / Warhammer 40K Crossover

They are my bulwark against the Terror. They are the Defenders of Humanity. They are my Space Marines and they shall know no fear. - The Emperor of the Imperium of Man

When all you ever knew is gone, and everything you ever fought for is lost, what will you do to get it back. Will you even need to? Will you even be able to?

Or will everything just get destroyed anyway...