There would be legends of the battle between the nothing and the Mara, if there were people to tell, or people to care.
No one can say who won or how long the fight lasted, if at all. Perhaps the Mara was gone in an instant or if its new body could take on something outside our universe, outside our knowledge.
Or perhaps, the mass and energy of the Mara was enough to sate the nothing, or distract it, to keep it away from our Universe, our new Universe, our new home.
Perhaps the Homeworlders know the outcome, know if the nothing will come for us where we hide now. But they are gone, hiding themselves in a new reality, leaving us to our own devices this time, should the nothing come for us once more.
Time will tell. And in the meantime there will be new legends, new stories. More heroes.
But this legend is forgotten, as it never happened, and everything is as it was in this new Universe that everything has found itself in, safe and sound.