OutCast, the reveal of my new story. (Not complete)

As of the recent release of my first story, (Doctor Whooves, An adventure beyond time) I've decided to turn things under a more original & hopefully successful concept. OutCast is one of many stories that I've brought upon myself with excitement & future hopes, of success to the brony public. To answer the question that many are possibly thinking here is the story & script of OutCast.

OutCast takes place years after the events of season four of My Little Pony, the mane six instead of solving & facing many everyday problems, now are retired & happily married to their "dream" stallion. Under the different marriage events, the mane six soon founded themselves raising their sons & daughters. The story revolts around Mystery Sparkles, the daughter of Twilight & Flash Sentry. Mystery was a extremely popular & respectful student during her school years, around her early age Mystery grew a huge interest of magical elements & power.

Her uncle (Master Potion Sparkles) happily agreed to take Mystery under his wing & taught her everything he knew under the past practice during the Great Unicorn War. The magic interest was sparked from Mystery's anxiety's & worries of the rebellion uprights against the laws of Princess Celestia & Luna.

Without any knowledge of the other countries Mystery wasn't aware of a possible war that would soon rage across the land. On a regretful day the rebellious leader Shadow Stalker made a successful attempt on killing off every princess & any tides with the loyal, including Twilight Sparkles. With Mystery's dad shipped off to Canterlot & Shadow Stalker now in control of Equestria, Mystery was token by her uncle, & faced extreme training under the magical power.

Mystery must now seek the sons & daughters of the mane six & hopefully form an alliance with each individual, as a conclusion to end the war & to also overthrow Shadow Stalker. With millions of ponies seeking hope from her & many places to travel Mystery will be tested to her fullest limit of survival.

This is her story!

The story will be released in the near future but will take day's or even months to finish, so don't expect it to be released any time soon.
Tell me what do you guys think of the concept?