I’m guessing none of them are psykers or the shadow of the warp would’ve driven them insane by now

@Background Pony #84E5  
Princess Luna: “TELL US WHAT HAD TRANSPIRED.”
 
Canterlot Guard: “Well, Twili- Brainy Smurf and the Hive Queen fought one another in an epic battle of two independent characters! The battle was fierce, but in the end, the Changelings proved too strong for her, resulting in her being gravely wounded!”

Princess Luna: So thou means to tell me that these beasts destroyed our royal guard- devoured the entire first company- and crippled the leader of the Ultramares- Brainy Smurf- when they first arrived? How in the name of Prince Bluebloods overinflated ego was this allowed to happen?
 
Canterlot Guard: Well, yes! All ultramares in the galaxy were needed to beat off the assault on Canterlot. But the two main events that are most important would be the confrontation between Twilight Sparkle-
 
Princess Luna: Brainy Smurf.
 
Canterlot Guard: …yeeeeeah…Brainy Smurf and the Hive Queen- And the event that ended the battle in decisive victory…(What the buck is a Smurf Anyway?)
 
Princess Luna: Well, we can already tell this is going to be a roller coaster ride of disappointment!

Fookin’ smurfs!

@Psychopomf  
Its cool
 
they have tau

@Psychopomf  

@Psychopomf
 

Too bad they aren’t Blood Angels
 
Then there could be teaming up with Necpones.

The battle for MareCragge, this will not end well.

Best crossover!

Nice picture but HOLY HELL why are there front hooves so thin?

Ultra pones Ʊ !

@Alalic
 
Artist’s deliberate choice.

Why don’t any of the pony marines have guns?