@equestrian  
Well, if I get that far, Twilight has a duel with Ahriman of the Thousand Sons, (not knowing how powerful he really is). That doesn’t end well for either of them. Here’s that section from the story, (and up to press about the only part readers haven’t complained about..)
 

 
The three ponies stood in a small room which was an off-shoot to the main hall of this building. Rainbow Dash had proven her speed yet again by grabbing the artifact from behind that scary looking soldier who seemed to be in charge here whilst he was distracted.
 
Twilight looked carefully at the staff. It was large, much bigger than she had anticipated, and seemed to glow faintly along the scroll work on the shaft with barely contained power. The sphere on the end of it also seemed to carry a fantastic array of finely wrought engravings, although looking at them made her eyes ache.  
However, something else was playing on her conscience whilst being this close.
 
The last time she had felt something like this was when a certain unicorn had come to Ponyville wearing an amulet…..
 
“Oh Celestia…” she breathed, “I hope you know what you are doing”.
 
A thump brought her back to the here and now. Heavy footsteps.  
“GO!”… she hissed at her companions, “take the staff and meet with the others. I’ll try to buy us some time!”  
The two other ponies looked about ready to argue with this decision, saw Twilight’s mind had been made up and that time was short, then made a hasty retreat out of the room back to their friends and allies.  
********************************************************************************  
Ahriman reached the area where he had seen the movement, and looked around the pillar with a little caution. Hundreds of years of experience had taught him not to rush in to the unknown blindly.  
What he saw took him by surprise.  
A tiny purple horse-like creature with blueish mane, wings, and a horn. He quickly sensed that this creature had great psychic potential too; far greater than it’s diminutive size would suggest.
 
The creature’s first magical attack was only just blocked by a hastily raised kine shield.  
The ancient sorcerer was thrown backwards in to the room several feet, although he retained his footing.
 
“Hmm”, he began, straightening up, “I believe you have taken from me something which I have rightfully stolen”.  
“We were sent to recover that staff”, replied Twilight through gritted teeth whilst walking out in to the room, “I do not intend to leave without it!”.  
“Then you leave me no choice but to take it back by force, strange creature”, Ahriman finished.  
His own staff glowed for a moment before unleashing a multi-hued blast of energy. Luckily for Twilight, she had been prepared for this, and the attack flared around her shield, instead blasting away the pillar she and her allies had been hiding behind moments before.  
She then responded in kind, but the huge warrior was far faster than she expected, leaping aside and sending another blast her way in one fluid movement.  
This spell crackled over her head, leaving behind a worrying scent of singed hair. The wall behind her crumbled away in a shower of dust.
 
This gave her an idea.
 
She shuffled sideways, making it look like she was sizing up her opponent.
 
Ahriman was wary. This equine creature was a small target, and was proving to be a capable opponent.  
He was beginning to think that maybe a change of tactics may be in order when a series of smaller spells were sent his way.  
Caught a little off-guard by his own wandering thoughts he nearly failed to evade them, his super human physiology making up for the momentary lapse. He responded in kind, the xenos creature hopping aside from his attacks, which instead blasted chunks from the masonry.  
“Hold still creature” growled Ahriman, growing a little impatient. He swung his staff around, the tip of the weapon almost clipping Twilight’s nose.  
“I think not!”, she responded, flying backwards in an attempt to put some distance between them.  
Another powerful blast of warp-spawned magic narrowly missed her, smashing out another pillar.
 
Twilight was beginning to grow weary. The magical warrior she was facing didn’t seem to be tiring at all, and it was only a matter of time before she made a mistake which could cost her her life.  
She only hoped her plan would work. It relied on her not getting too close to her enemy, who would almost certainly overpower her in physical combat, and keeping him distracted from her true plan.
 
She carefully positioned herself close to the exit to the building, near to one of the columns.  
“I have you now”, snapped Ahriman, levelling his staff. The pony (he’d decided that was the best description for this creature), looked ready to leap to it’s right, but he second-guessed that this was probably a feint, and sent his last attack slightly to her left.
 
The magical attack tore through the pillar in a cloud of masonry and dust, but also blasted the purple equine clean out of the building.
 
“Hah!” he laughed smugly, seeing his adversary’s prone form on the grassy area outside the vestibule door. As he began to walk forward to get a better look at his strange opponent however, a slab of stone smashed down beside him from the roof.  
Ahriman looked slowly upwards, realization dawning on him of what that pony had really been planning.  
He barely began to utter the words “OH SH…” before the whole building crashed down around him in a shower of broken stone and dust, trapping the sorcerer under tons of rubble.

@40kponyguy  
That setting might be a good idea.

@equestrian  
Thanks. There’s a lot of work in a page for this though.
 
I’ll try to get back on with it once I get a few individual pics sorted, (or maybe in between).
 
Never did get around to writing the last chapter or two, although I know how it’s going to finish, and the events.
 
I wanted to do a 40k crossover story that had something different.  
Almost all other crossover stories have one of the 40k races landing on Equestria, not the ponies visiting the 40k setting.

This comic is interesting so far.