A strange condition has Twilight courting death in the wake of her battle with Tirek. Now her life depends on Luna, and both lives will be affected. Hopefully for the best.
Twilight Sparkle is called away to tend to Luna when she falls ill. As Luna grows sicker and Twilight more determined to help the younger princess, she begins to uncover dark secrets about the elements, the alicorns, and her own past.
Twilight Sparkle wakes up to a very unwelcome idea. Now she needs to find a way to clear it out of her mind. Because if she falls asleep before it's gone, the Princess of Dreams will get to see that idea for herself.