Rainbow Dash has always been a loyal and caring mare, she was always there for her friends. She was the one they could and would cry into, and she would console them. She may not have been the best friend nor the most modest... But she most certainly didn't deserve what was coming for her.
Discovering she was jumping dimensions every night without trying, she must find a way to reunite her friends, whom are scattered around different universes like she, and that is if she can.
As the colours in her died, her loyalty did, and so did her friendships. The Element Of Loyalty changed it's Wielder the second Spike wore the ornament.
Rainbow's soul is practically sewn with thread to the magic of The Element Of Loyalty... Removing that thread made her soul crumble.
Her friends deserted her, and so did herself...
So can I ask you a question, Rainbow?
Who are you?
Hello! I know i've done plenty other stories, but A Rainbow's Lament is probably the first one I'm feeling okay with. Therefore, I dub this story My First-Not-Futile-Attempt-At-A-Story Story.
Since it is so, don't be too shy on the comments, kay?
Have fuuun 
You really need an editor for this. The concept is good but your pacing is just..way off.
You're doing chapters of less than 1,000 words when each of these could probably be much longer and build the world at a much better pace.
Let me put it this way:
It took me less than 5 minutes to read this story and already she's been replaced as the element of loyalty, met a shadow, hopped a dimension and met a twisted version of AppleJack.
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Thank you so much for your advice! I know the chapters are pretty short, but I was doing these in the midst of final exams and so it was pretty hard for me to balance them all, studying and writing.
I would get an editor but... I honestly don't know how.
I will try to improve the length and my style of writing in general a lot more now since Summer Vacation has begun. Again, thanks.
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Glad I could help :)
One of the things I do in my own writing (not that I've posted any yet, but hopefully soon) is I'll hand-write out the first the plot for the whole story (major points), then I do into major points that I want to cover for each chapter. Then I write a first pass of a chapter,
Then, as I'm typing up the chapter, it's a lot easier to recognize places where you can go into more detail, or be more descriptive.
Don't give up hope! Writing is a skill that can take years and a lot of practice to develop.