This story would follow Apple Bloom, and would take place in the far future. Now the entire premise of the plot is that Discord, while a demi-god, had only gained his power and status by serving an even higher god - Chaos, God of Change and Destruction. When Discord turned good and began using his powers to help Equestria, it enraged Chaos as he saw it as an act of betrayal and so he decides to take matters into his own hands, so he sets in motion a plan to return to the mortal plane to seek vengeance upon his traitorous servant.

Apple Bloom ends up getting involved in this plot after she discovers that Luna (and by extension Celestia) are servants to Harmony, God of Law and Order, after a strange dream in which Luna views using her dream world powers granted to her by her deity. Apple Bloom's dreams are a premonition of future events as she is linked to Chaos through a curse placed upon the Apple Family Tree, a curse that would only affect those who have great magical potential (AJ wasn't chosen due to her close connection to Harmony which would break the curse).

While Apple Bloom can see future events, her body and mind are also slowly becoming twisted by the curse. She, with the help of Luna, Celestia, and Discord, have to keep Chaos contained away within his realm in order to prevent the curse from spreading due to the curse's effects being enhanced because of Chaos' presence on their plane. Not only this but if Harmony was to discover what was at play here, then the peace treaty agreed upon by the two gods would break and once more a Holy War would take place upon Equestria.

Essentially the story is that Apple Bloom, alongside the two princesses and one weirdo of a Draconequus, must work together while keeping everything under wraps in order to prevent the release of Chaos. Apple Bloom has to balance her normal life with her now hectic life of stopping crazy cultists from breaking the seal on Chaos' world.

Also for those who may be wondering to why the treaty wasn't broken due to Discord's actions beforehand, at that time Discord wasn't serving Chaos and was acting out his own desires so he wasn't considered Chaos' servant at the time. The only reason why Chaos didn't come for him while he was indulging himself was due to Chaos' entertainment at his minion's actions, so he allowed the demi-god to live.

The story is still in production, but I would like to ask anyone who's reading this on what their opinions about this are and is there any way the basic plot can be improved upon?

So Applebloom is pretty much the chosen one? I can get behind that.