The Tantabus took a mighty step into the rift between the dream world and reality.
“We all trust you, Luna!” said Twilight Sparkle. “Do you trust us enough to believe we're right?”
Princess Luna paused. She did trust them. She knew she could finally forgive herself. “I do!”
The Tantabus stopped. Its will had grown powerful from feeding upon the Princess's nightmare, but suddenly there was no more fear to sustain it. It shrunk back to pony size and was compelled to reunite with Luna. It could no longer, for she had fully accepted it back within her heart.
Luna smiled “Thank you. Thank you all. But what's that noise?”
A steady rumbling could be felt throughout the dream world, and it was growing louder by the second. The source could not be seen, until a familiar voice shouted out from within the group. “Shared dream world not perfect! Yaks SMASH!”
A sphere of light surrounded Rainbow Dash, and three yaks leapt out of her head with a discharge of magic. Their amorphous shapes glowed with the lights of the night sky, just like the Tantabus.
Fluttershy glared at the yaks. “Ohh no, not you again! Why can't you ever stop ruining things?” She flung herself into battle.
Twilight watched in confusion. “Are these more nightmare creatures? Can you stop these too, Luna?”
“Yaks SMASH!”
“Be QUIET!”
Luna's jaw hung open. “I... I don't know! Where did these come from?”
Rainbow Dash rubbed her mane and chuckled nervously. “They're actually my old buddies, and they've kinda been living in my dreams all this time.”
“Yaks SMASH!”
“Be QUIET!”
“This means I have no control over them,” said Luna. “Rainbow is the one who must reign them in and absorb their emotions, much like I did with the Tantabus.”
“Aw, I'm sure they don't mean any real harm,” said Rainbow Dash.
“Look,” shouted Twilight, “they found the rift! They're trying to reopen it so they can go through!”
“Listen carefully, Rainbow Dash,” said Luna. “I must teach you how to control this dream, so you can--”
“We're too late!” Twilight said as she watched them disappear into the glowing portal.
Rainbow winced and smiled sheepishly. “Apparently they're pretty good at breaking through things. Who knew?”
The yaks stumbled their way through the blinding light.
“Where this?”
“This.... real world?”
“Me feel funny.”
Their eyes slowly adjusted, and soon they could make out the shapes and colors of the world around them.
“This... glowy machine room?”
“What this say? 'Season 5'? 'Episodes 14 to 26'? What that mean?”
“Me get feeling this important holy land. Yaks must not touch.”
They reverently tip-toed through the aisles toward the exit door. They were interrupted by the dream rift tearing open once more, launching a furious yellow pegasus into the group at high speed. The impact bowled them over into several shelves of fragile electrical boxes.
“You thought I wouldn't find you?! Nopony escapes from Fluttershy!” She swung her hooves like a whirlwind around her as the yaks fought back, turning the enclosed room into a maelstrom of violence and destruction, annihilating everything within its walls.
“Yaks SMASH!”
“Be QUIET!”
END