Story idea?

Hello my fellow....people? I guess that sounded wrong, let me start all over again...Hello everyone and I have a somewhat idea for a story I want to write...ah that sounds better! Anyways, everyone knows that some HIE stories are good and others...eh, not so bueno. My favorite type of human stories are does with the human been the main antagonist of the story, because who doesn't like the bad guys! There are some good human antagonist stories, but the ones I hate are the ones that makes the human too...OP AS HELL! Like come on bro, it kills my hopes to continue reading the story. And I was thinking,hey, why don't you make a story instead? I was so hyped of making a story, that I completely forgot about the fact that...literature skills aren't proficient, I mean it's not like my grammar sucks(they do), but I know I'm gonna make some mistakes along my writing. Maybe before I submit my work, I think should someone to proofread my work, and also I have to develop my character(ugh this sounds like work), and the list goes on. I think I went a little far away from topic, let me tell you my story idea and of course I would like some opinion from all of you! Warning this gonna be a long ass story idea:

long time ago, going way back before the unification of the three pony tribes...the world was in darkness. Not literary of course, but the world was ravaged by plagues, famine, monsters, tyrants...and fear. All this misfortune of the world was caused by a dark ancient entity known as The Antagonist.

The Antagonist fed through all the evil of the world, with his constant supply been infinite he indirectly ruled the world with malice. But all his future plans will soon bee thwarted by a force of good...Harmony. In the name of peace, Harmony spread all its energy throughout the world to erase all that is evil and dark in nature. Evil tyrants were over thrown and replaced by righteous kings, vile monsters killed by courageous heroes, hatred between species soon replaced by love and unity. Antagonist enraged by his sudden diminishing of supply, campaigned a long, proxy war against Harmony.

Thousand of years had passed and with the Fall of the Crystal Empire been his latest setback, it was time for him to personally confront the wielders of the elements(been the princesses at the time). Battle after battle, he knew that sooner or later...he will be defeated. So in a act of desperation, he seek to corrupt one the wielders in order for the elements to become useless..and it worked like a charm. After the banishment of nightmare moon, celestia though victorious she not only lost her sister but she was weaken after the battle. With no time to waste, the antagonist confronted a weak celestia...in hopes that he can finally end the stalemate. But against all odds, Celestia prevailed and had the chance to defeat the antagonist, but ultimately causing the elements to become stones. The Antagonist though defeated, he was able to turn the most powerful weapon ever made into mere rock but it cost him dearly as he was weaken and with few power left to keep him alive...death was becoming the new fate. In a final act of preservation, he transfer all his powers into an egg and from there became dormant, in hopes of one day he will rise again in a new form.

Thousand years later, an egg was found in the deep caverns of Canterlot, and later use for the entrance exam for Celestia's School for Gifted Unicorns, where a certain purple filly was about to learn whether she passes or not. So ugh, I know it was long..but what do you think?