[Sad][Dark]
Description: Twilight Sparkle has learned a new spell called "Dreamscape," which allows her and her friends to enter dream worlds within the margin of their subconscious. But these dreams are as malleable as they are dangerous, and each trip they take threatens to cause them serious harm and skew Twilight's perception of reality.
Meanwhile, Spike is beginning to struggle with an old demon of his again. Only this time, his greed is more tempting, more malicious, and sentient: scheming to consume his every thought like a virus until there is nothing left of him but avarice.
To keep their friend from becoming their new nemesis, the Mane Six must travel deep into Spike's subconscious and plant a thought in his mind that will forever make him contradict his dragon heart's innate inclination for greed. However, their mission will be difficult, dangerous, and the ends may not justify the means.
But sometimes, to save your friends, you must change them.
DECEPTION (New Part 12!)
Additional Tags: Spiritual crossover of MLP:FiM with Inception