@Background Pony #A98E
Oh wow. This is a well-detailed tragic story for poor Celestia you’ve crafted. I mean wow!

@Nightweaver20xx  
But if she’s really immortal then she CANT be killed

@Prometheus labs CEO  
Nah, I’m pretty sure ponies die when they are killed.

@TheSneek  
If she truly is immortal(which I’m guessing she is or she probably would’ve killed herself a LONG time ago) then that would do nothing but serve to throw her into the void of space. No air, No sound, the only light being from stars so distant that many of them died eons ago, it would be new home, and her new hell.

@Background Pony #5439
 
Or at least until the sun goes out.

Immortality  
While you live on everyone else dies and you slowly die inside with them

@Background Pony #5439  
PRETTY sure she doesn’t have that sort of immortality. Then again, if the series is her delusion in this scenario, all proof that she is killable may well be her fantasy.

@Background Pony #5439  
+1 comment. That was good stuff, my kind of fic.

@NorrisThePony
 
Those shadows outside look like ruins to me.

@Eeveeinheat  

I could see that as a dark story. I’ve thought a few times myself that Celestia actually has a pretty horrifying existence if she perceives time at all like we do. I mean, just knowing how long a month can seem as a child and how short it can be as an adult, after a thousand years it must be hard for her not to lose track of entire lives without noticing. Something like that would make communicating with anyone not immortal a challenge at best.
 
Although to be honest, I think the image here could make for a worse story than that. Based on the light we see shining through behind her, and the jagged shapes in the shadows, I could believe this is far in future when there isn’t anyone else left. It’s just her. Alone. An eternal, unchanging figure so far gone from eons of isolation that nothing registers with her anymore. A being so out of place in time that even the stars themselves seem fleeting in the night sky. And here she sits, as the glaciers zoom past and the landscape reshapes itself around her, unable to die, unable to age, the shattered fragments of happy memories stretched thin across the billions of years she’s existed. The fantasy she concocts is almost a blessing in that sense. It distracts what’s left of her mind from any understanding of what has happened, and from the realization that someday the universe itself may fall into darkness, but she will still be here.

This would make for an intriguing fic. Especially if told from the POV of her hoofmaids or other such servants. I can see it now: the struggle to make her presentable before public events; making sure every word out of her mouth is pre-written by the best speach writers in Equestria. Can’t have the populous spreading rumors that something is amiss if Her Majesty opened her muzzle and spewed her actual, asanine thoughts, hmm?

@SFaccountant  
I don’t think it’s post-end of the world, I think the implication though is that all of the events we see in the show (Luna returning, Twilight turning out as a prized pupil, the show’s foes being easily done away with) are fabrications of a Celestia who has either snapped completely at some point, or at the very least is coping by using wishful delusions.
 
Just going by what the source description says mind you

You get to run a nation for a few millennia, and then after it’s lost to the ashes of time you get to spend the rest of eternity writing fanfic.  
Could be worse.

I want to imagine Discord’s face on a balloon poodle.

Pretty fucking depressing