My dream started off with me being in Equestria as Indigo. For some reason, there was a human kingdom who suffered a catastrophic natural disaster, leaving their territory in ruins. They started conquering every other territory that wouldn't accommodate refugees, for some reason. Suddenly I was propelled forward in time and I was in the middle of the ocean. The water was warm and a ruined Ponyville sat beneath the waves. I swam to the top and eventually learned that the humans had subjugated Equestria with their war elephants and massive black metal armor or something. With Equestria's small army, Celestia and Luna were really the only ones who were able to fight, and they ended the war to prevent suffering and let Equestria be subjugated. At the current time the princesses were puppets to the human emperor. Humans and ponies pretty much got along, but I decided to go on a long string of murders of snapping lone humans' necks with my front legs that somehow were going to get me into the emperor's palace and allow me to poison his food and blow up the palace to reinstate the princesses. I was basically the pony version of Guy Fawkes.