Almost a year after Celestia's great crusade against necromancers concluded, Mortem discovers a rather large army outside his castle. Not wanting to cause an incident, he works towards a diplomatic solution.
After the defeat of Tirek, a special letter arrives with news from a secluded town in the middle of Nowhere. Now the main six are tasked with finding out what happened there, and who this Mister Baker really is.
There is a secret held in the dungeons below Canterlot, deeper than the crystal caverns into the roots of the mountain. This secret is a creature imprisoned by the Princesses. It is a source of great knowledge, but may ultimately be a great enemy.
When the ignorant find knowledge they are dangerous. One man understands this, and so seeks to educate the nation he once fought for, and to bring down it's tyrant ruler.
A particularly stubborn human is lost in Equestria and is trying his damnedest to find a way out, while surviving the surprisingly difficult rigours of life in a land filled with cute talking animals. Hilarity ensues.
For thousands of years ponies have prospered in Equestria living in peace. For thousands of years humans have prospered in secret living in fear. To ponies the humans are less than a myth. To humans, ponys are death. Once again they shall meet.
A human soul is stuffed into King Sombra's body. Having no idea what's going on, and thinking he is in some kind of coma, he just casually strolls into the Crystal Empire.