Celestia just wants a quiet moment between duties. Discord doesn’t think she smiles enough. He sets out to remedy this without tact, finesse, grace, nor empathy.

When Prince Sombra meets a beautiful crystal pony in the royal court of his father's kingdom, it is the beginning of the end for his home, sanity and soul, proving that no good dead goes unpunished when Sombra's father takes pity on the mare and her dying husband.