It is the 41st Millennium in the Equestrian Imperium. It has been nearly 10,000 years since Empress Celestia banished Nightmare Moon, thus ending the Lunar Heresy. The Goddess-Empress of Ponykind senses Nightmare Moon returning to conquer the Equestrian Imperium. Space Marine Librarian Twilight Sparkle is summoned by the Empress to find five more Space Marines across the galaxy to eventually face Nightmare Moon.

Now, Twilight Sparkle and her trusty cyborg baby dragon assistant, Spike, travel the galaxy in search of these five ponies. Little does she know that in many parts of the galaxy, there is no harmony. In many parts of the grimdark galaxy...

There is only war.

(A Ponified Warhammer 40k fanfiction I hope to complete someday.)
(Thanks to Angel of Speed for proofreading this, and to Matthais Unidostres his support.)