This is a scene from the fanfic I have been working on.  
I haven’t had much luck getting Twilight’s wings to look right on this picture, and I’m sure there’s artists out there that could do a far better job of this than I ever could.  
It’s not quite finished either. Need to do the road yet.
 
Here’s the scene from my fanfic that the image depicts…
 
The titan turned a little at it’s waist, then raised it’s vulkan mega bolter.  
‘Well’, Vorenze addressed his remaining troops,’ it’s been an honour serving with you’.  
He close his eyes as the weapon fired a stream of mass-reactive shells, resigned to the fact he and his allies would be blown apart.
 
The shots didn’t hit.  
When Vorenze opened his eyes again, the shells from the titan hung suspended in the air several feet away in a strange purple glow.  
The glow subsided, and they clattered to the ground.  
Looking around for a reason for this, he saw that all his allies were staring dumbfounded in the same direction, and not at the titan.  
Following their gaze, he saw a small purple horse creature stood between them and the titan, it’s horn surrounded by the same purple glow he’d seen around the shots moments before.  
As he looked around, strangely detached from the scene unfolding around him, he spotted something his other troops had missed.  
There seemed to be a group of these creatures hiding behind a ruin a few feet away.  
The ratling sniper Fenrick stood with them.  
‘Well well’, admitted Vorenze,‘looks like you found something useful after all’.
 
Twilight stood before the immense machine, her mind racing.  
How could one little pony stop such a huge machine?  
Her magic had been able to stop it’s shooting, and it appeared to be stunned for the moment, but this certainly wouldn’t last.  
She needed to take it down somehow.  
The alicorn looked around for something, anything she could use.  
The surrounding area was littered with demolished buildings, broken pipes, girders and still smouldering debris. Most of this was too small to really do any damage.  
Her wandering gaze settled on what was once probably the corner of a tower block. The fifteen foot long ‘L’ shaped concrete block probably weighed several tons.  
This was going to be a strain.  
The last time she’d lifted something that big was when the Ursa had come to Ponyville.  
A purple glow surrounded the rubble and it slowly lifted in to the air.  
Twilight’s horn flared brightly, her face a mask of desperation.  
The titan’s weapon barrels began to spin up again ready to fire.  
This made Twilight panic. She could get blown apart at any moment.  
With a final burst of magic, she hurled the rubble at the titan like a spear.  
A few rounds began to stitch a path across the ground in a zig-zag pattern trying to find the range to hit the tiny magical creature that dared to challenge the might of the god-machine.  
The chunk of masonry smashed through the cockpit window of the Warhound, crumpling half of it inwards with the impact. The momentum of the broken building was enough to drive it clean through the roof of the titan’s torso.  
The titan rocked back and forth, impaled, before it’s corrupted machine spirit finally decided it was dead.  
It toppled backwards with a groan and an earth-shaking crash.  
After what seemed like an eternity, two sets of cheers rang out across the desolate landscape. One from the ponies once the shock of such an epic display of magical power had worn off, and the other from the rag tag group of soldiers who would almost certainly be dead right now, if it wasn’t for their unlikely saviour.