Anomaly: Something that deviates from what is standard, normal, or expected.
 
Rule 34.2 of Alternate Dimensions: If you exist, there is another you in another dimension.
 
In every fiction, if you exist, another version of you exist as well. Maybe both of you have similar personalities, maybe slightly tweaked due to different surroundings. Yet the both of you could also be so different in personality. This is Rule 34.2.
 
But, somewhere in the universe, one defies this rule, someone that deviates from what is standard, normal, or expected.

Then, what explains this irrational anomaly? There must be a logical explanation on why there was only one. Perhaps there has been some mistake.

Inspired by a true story.

If you made a promise, keep it. If you have love, cherish it.

Indeed, being blind for the rest of your life is very inconvenient. But when a mare starts to give a huge promise to her significant other, how far would she go to fulfil her vow? How far would he go to strive for the one he loves?

Little did she know, she's keeping a promise one can't simply hold.

It is what it has been written and foretold.
The princesses shall go without thrones.

Perhaps he has grown callous of it. His past, his future, his very existence. Does any part of his life even matter?

We believe in Equestria, the land that will soon meet its downfall. War, famine, poverty.... in the midst of these times of strife, an unexpected menace will unearth from its grave.

Only in the finest hour shall the Mesias rise from the dark, and the prophecy shall meet its verity. And so it has ushered, an era where kingdoms become obsolete. A new era - where dark seeketh light.

For that is his fate. Nameless, unworthy to reign, bringer of dark. He shall then live, without ever knowing why....