Darkness, a word that's associated with those that are evil and corrupted, it is also said that a world can not eliminate darkness or light for they are the sides of the same coin, eliminate darkness and it will bring forth an even powerful form of darkness, the same can be said with light, but one individual is trying to prove that logic wrong by gathering the greatest darkness that Equestria has ever known or any version of Equestria has ever known and no sun goddess or group of mares will stop him.