"Luna's Future" is a song in the Christmas special, "A Hearth's Warming Tail" from My Little Pony. It is sung by the Spirit of Hearth's Warming Yet to Come to show Snowfall Frost what the future will look like if she casts the spell to rid Hearth's Warming from Equestria.
Spirit of Hearth's Warming Yet to Come:
I see a cold wind blowing through
I see days neither fun nor free
I see a future caused by you
I see a path not meant to be
The future should be filled with magic
Dreams and wishes brought to life
But the days ahead are dark and tragic
No time for hope when all is strife
Whatever might have been
All the dreams that ponies share
Because of you, Snowfall Frost
Now the future is a cold nightmare
Snowfall Frost: Windigos?! They aren't real! It's just a little filly's story!
Spirit of Hearth's Warming Yet to Come: They are all too real, Snowfall, and your actions will allow them to return. The future of Equestria shall be bathed in a blanket of eternal snow!
Snowfall Frost: No! I never meant for this to happen! I didn't understand! I didn't see how important Hearth's Warming Eve was! Please, spirit! I haven't cast the spell yet! Is there still time?! I'm sorry! [echoing]