[Fate] is a Being that has its own sense humor, some call it twisted and cruel, others see it as selfish and egoistical. There are things that have to happen, and [Fate] will always make sure it will not change. Its job is to ensure that all Threads will meet their Ends, but in the Infinite Multiverse, there is always a chance for an outliner.
For one Thread going off its course.
For one Event to never happen.
[Fate] always ensure that all Threads will meet their Ends.
Any means necessary.
In a doomed Equestria where Spike's egg was never found and recovered [Fate] saw a chance for Salvation of the seemingly unsalvageable World. One change was all it could do, but when everything as at stake even the tiniest alteration worth more than can be comprehended. Twilight Sparkle was Destined to become a Legend, so it will be only fitting for her to have Legends by her side.

Unwavering Loyalty that transcends even Life and Death.
"We have nothing to talk about, you're a threat to Mother and it's all the reasons I need to fight you."

Untainted Spirit that shines brighter than the Stars.
"We're together and it's all that matters, you can't stop us no matter how hard you'll try!"

Unbreakable Will that melts all Chains.
"Shut up! All you do is ranting about your little pity party! Well, I don't give a shit whoever you are, all I care about right now is kicking the shit out of you!"

Unshakable Determination that soars above the Skies.
"It doesn't really matter what you will try to do, we're beating you here and now. It's simple like that."

Untamed Instinct that never leads Astray.
"You see, that's the difference between us. You aim to Win. We aim to Kill."

Unlimited Power that burns through the World.
"You still don't get it, do you? We're stronger than you, better than you, you have no hope for victory! Just roll over and die, trash!"

Unmatched Rage that shatters the Heavens Above.
"HREEEEEEEEEEEEEEEEEEEEEEEEEHUUURRRRRRUNNNNNNGG!"

Unquestionable Love that bonds Them.
"Don't die! I don't mind if you don't win. You don't even have to try. So please, don't get yourself hurt any more..."

The World is Not Prepared.
"... Sister, what have you done?"

How Chapters are Labeled:
[Name] - [Season].[Episode].[Part]

My Little Pony: Friendship is Magic/Godzilla