Discord is a recurring character and former antagonist introduced in the season two premiere. Princess Celestia explains that Discord is the spirit of chaos and disharmony who once ruled over Equestria in a state of unrest and unhappiness, until she and Princess Luna used the Elements of Harmony to imprison him in stone. However, after the sisters lost their connection to the Elements, the spell was broken and Discord broke free. Later in the series, Princess Celestia decides that Discord should be reformed so his magic can be used for good.
The word "discord" means "a lack of harmony" or "a disagreement".
YOU ARE READING
MLP:FIM The Pegasisters guide book
Randomevery pegasister needs to know this, so why not have it all in one place?