This series uses backstory from The Last Draconequus and directly proceeds from Princess Twilight Sparkle Endcaps. Series in general is rated mature for torture and rape, though not all individual stories contain these components.
Discord In Hell (Not Literally): Discord travels to an alternate timeline so he can have fun without angering his new friends, and ends up in a horrible situation.
Twilight Sparkle's Report On Fluctuations Of The Local Entropic Gradient And A Proposed Solution : Twilight Sparkle, element of Magic and Order, reports to Princess Celestia on her findings regarding the apparent re-emergence of Discord. Technically speaking this story occurs chronologically before "Discord in Hell", but it makes no sense if you have not read that story.
Dragonfire and Sympathy: Spike is trying not to muster up any sympathy for Discord.
Light Rain: Discord shows Fluttershy rain made of light. Chapter One is compliant with the fourth season and takes place after "Detente", before any of the stories here; Chapter Two takes place after "Dragonfire and Sympathy".
Elements of Opposition: The Mane 6 go to the alternate universe to save Discord. This gets graphic. Be warned.