The giant that holds up the sky, ponies say this is a legendary beast of old ponytale that keeps the sky up, other say they are nonexistent.
Of course the legend must be true since every single other legend was true too.
Stratos Fallstreak is this particular legend, a stallion of neutrality, isolation, and a particularly large fan of Cherry Jello. His usual everyday and night activity is going to change after fixing a problem a bit too late over Ponyville.