The night after the Crystal Empire was saved, Twilight Sparkle had a vision in her sleep of King Sombra warning her that he would return soon. Twilight grows worried but has faith that the power of friendship will conquer him. King Sombra may have not spoken much during the battle, but he has plenty to say to Twilight...
This short story was written up in just a few days and might be a bit choppy so I apologize if it seems that way...
Image drawn by atryl on deviant art. http://browse.deviantart.com/?qh=§ion=&global=1&q=King+Sombra#/d5ktry5