This story is a sequel to Celestia Uses An Online Dating Website

The God Emperor of Mankind is in Equestria, and he's looking for love. Good thing for him that Celestia is looking for the same thing. The problem is that he's a warmongering immortal monarch, and she's a benevolent alicorn princess, so clearly they'll get along swimmingly. Here's hoping Equestria survives their relationship!

For ten thousand years Princess Celestia and Princess Luna ruled over the peaceful land of Equestria. But something dark is beginning to stir in the shadows of space. Eternal, violent, mindless and bloodthirsty war. It was during the Age of the Old One's, or in human terms Horus Heresy. To make dreams about creating a utopia for their fellow ponies the Princesses of the Sun and the Moon unleashed a powerful spell that covered Equestria and Moon, hiding them from the war. The Royal Sisters buried the memory about the universe and they create harmony. But the spell wasn't powerful enough to hold for eternity, and even the Princesses effort didn't help. Probably one of the biggest manifestations of power in the entire universe vanished, revealing a peaceful nation of colorful, speaking ponies to the grim darkness of a galaxy wide war. It would be the end for Equestria, but Princess Luna managed to convince General Anders from the Imperial Guard, and Equestria joined the Imperium of Mankind. But to do this, the Princess of the Moon made a sacrifice that cast thousands of ponies into the oblivion.

That, was how The First and Only was born.

Applejack heard the whine of Gaunt’s chainsword as the commissar leapt up the scaling ladder nailed into the trench wall above the firestep and yelled to his soldiers.

“Ponies of Equestria! Do you want to live forever?”

Their reply, loud and raucous, was lost in the barrage of shells. But Ibram Gaunt knew what they had said. Weapons blazing, Gaunt’s Ghosts went over the top and blasted their way towards glory, death or whatever else awaited them in the smoke.

Forget the power of kindness and goodness, for so much has been forgotten, never to be re-learned. Forget the promise of friendship and magic, for in the grim dark future there is only war. There is no peace amongst the stars, only an eternity of carnage and slaughter, and the laughter of thirsting gods

Big Macintosh has fallen hard for the pretty blond mare. When she is forced into a fight for her life, he sticks by her faithfully, but keeping the promises he's made will be an even tougher battle.

Updated for Equestria Daily! Yay, made 6-star!

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Written for a sadfic contest (I won!); the plot is in honor of my mother-in-law, who wasn't so lucky, and I suspect wouldn't actually appreciate inspiring a story about ponies.