This series consists of stories before, after, in or around the episode "Princess Twilight Sparkle". It is probably safe for everyone but was rated teen for an occasional "damn".
It is part of the Canon Compliant to Fourth Season series.
It uses Discord's backstory from The Last Draconequus.
Vines: Pre-episode story. What Discord was doing before he was summoned.
Detente: Post-episode story. Zecora and Discord have a conversation about the Tree of Harmony and Discord's own future.
Light Rain: Discord shows Fluttershy rain made of light. Chapter One is compliant with the fourth season; Chapter Two is the lead-in to the series Elements of Opposition, which is rated mature.