This story is a sequel to Rot

After the events in 'Rot', Twilight Sparkle has finally come to terms with her new self. Can she control her new powers? Can she ever have anything close to a 'normal' life again? And what happens when Discord's past mistakes come home to pass judgement on the 'new' Princess of Friendship?

Twilight Sparkle has always been frustrated with Discord. His ability to do anything, with no more effort than a snap of his claw. It shouldn't be possible. His power had to come from somewhere.
Then, one day, Twilight lets slip how she feels. Surprisingly Discord agrees to explain it to her. To give her the secret to all of his powers. If she's willing to pay the price that knowing it all will bring.

This story is a sequel to Rainbow Factory

Cloudsdale Weather Corporation has been running without incident for over twenty years. That is, until two foals manage to avoid being processed and find themselves in the haunted bowels of the massive facility. Can they make it out of the abandoned factory with their sanity intact? Will they uncover the secrets even a company as dark as the CWC is ashamed to keep? And what of the workers who help ensure that, in the end, not a single soul gets through...

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—[TVTropes Article]—[Plagen Shiki's Reading]—[The Song Inspired by the Story]—