If anypony was reading Apples: Immortal Tree

I need some ideas to wrap it all up. If any of you have been following and
SPOILER ALERT
Applejack has just found out that despite her getting rid of her inner impurity, she can't stop the eminent death of the Skyline unless she can now stop the Demiurge, a beast called Nightmare, and the forces of Tartarus, maybe even a representation of Tartarus itself. With Megan's death, Applejack is now officially the goddess of the universe basically, and has an army ready to dance in the rain of blood for her if they have too. I was just wondering if anypony could suggest some ideas.
There will also be a Nightmare Rarity and an evil version of each Element of Harmony.