This story is a sequel to Past Sins

Hearth's Warming is a time for friends and family to come together, celebrate harmony, and welcome the new year. Nyx is looking forward to just this as she rides the train to Canterlot with Spike and Twilight. She's going to meet her extended family for the first time and wants nothing more than to make a good impression. Yet, the sheen of the holidays can't hide the trouble caused by meddling grandparents, relentless reporters, and a paranoid uncle.

Rainbow Dash returns from an evening in Cloudsdale to find Pinkie Pie in a dreadful state after a terrible nightmare. The pegasus tries her best to comfort her friend, but will it be enough?

Image by microgrid (http://microgrid.deviantart.com/).

Spanish translation by SPANIARD KIWI - https://www.deviantart.com/spaniard-kiwi/art/La-luz-en-la-oscuridad-970255243
Reading by Agent Fluffy - https://www.youtube.com/watch?v=BdVGfjmnsrM
Reading by Alchemystudent - https://www.youtube.com/watch?v=fcdJtTA5A14
Reading by AJ Earthbend - https://www.youtube.com/watch?v=Nw_sIt1PfQ8
Review (sort of) by Changeling Number 32 - https://www.youtube.com/watch?v=gEb_xv9eQdo

My Little Pony: Friendship is Magic and its characters are owned by Lauren Faust and Hasbro. Characters are used without permission but with the greatest respect.

Deep in the Royal Library is a book. A terrible book that is said to send whoever reads it mad. A book so dangerous that it has to be hidden away and secured with chains to prevent it from ever being opened.

A book which has just been accidently checked out by Spike on behalf of Twilight Sparkle.

The Star In Yellow is rising once more, and only Rainbow Dash and Spike can save Twilight before it's too late. Ideas live forever. Ponies do not.

This fic is loosely inspired by the 19th century story 'The King In Yellow'.

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?