@Background Pony #18D8  
It’s a loooooooooooooooooooong story.
 
It started out as an examination of the Mane 6 (and Trixie)’s psychological status as Discord’s mind games in the maze way back in season 2 took their toll on them. Then after that, “Season zero” was capped off with a bad future where Discord had ruled the world for 1000 years with the discorded mane 6 as his enforcers.
 
Then came the “Reharmonized” chapters that take place after the season 2 premier where Discord’s sealed away but the emotional scars he left on not just the mane 6, but the rest of the cast from Silver Spoon to Prince Blueblood and how people were dealing with it.
 
Anything else would be very spoilerific, but I will say that while it’s definitely darker than the main show, the whole theme is that there’s always a light at the end of the tunnel, no matter how hard you have to fight for it.
 
If you’re not intimidated by it’s length, it’s a thumping good psychological read examining what the elements of harmony mean and how you can use them and their opposite counterparts’ concepts for good AND for ill. Says a lot about an author’s skill when he makes you feel sorry for the G3 ponies.

@Takashi.0  
I know it maybe hard question to answer but what are the stories about? They are some grimdark ones that i know from drawings. Is there sex? Murder? Comedy? Drama? Is it just a dark story? What would be a synopsis for this universe/story?

@Background Pony #18D8  
http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/PonyPOVSeries?from=Main.PonyPOVSeries
 
A very long, very detailed fanfic that grew and grew and even incorporated the past Gens of MLP into its mythology.

What is - pony pov series ?