What turned King Sombra into the dark being he is today?

When a series of natural disasters strikes Equestria, Spike and Twilight live their last moments.

Rarity becomes depressed after Applejack is killed in a fire after an argument

One of Celestia's assassins is framed for murder and is hunted down by a corruption within the guar

Alphion returns to Equestria, with his sights set on domination.

Spike gets Teams Fortress 2

Twilight discovers the wonders/horrors of fanfictions.

Rainbow Dash and all of Equestria is enveloped with an unending nightmare.