Sequels are never as good as the original. It's the Fourth Law of thermodynamics. Luckily for us, everybody (even Twilight!) ignores this.
So, when they face a new challenge in the form of four McGuffins they know nothing about, well, they're going to do their best!
Except they aren't. Yeah. Well, not exactly -four ponies want to use those objects to save the sequel, and the other four want to destroy it. There are a dragon and a bird somewhere else, but who cares about them? And they are not the ponies they were at the start. Oh, no. They know the rules now. They know what is off and why, what to use and what to expect in this kind of situation.
The fourth wall was shattered so much in the story this one is a sequel of that here is less of a wall and more like a piece of glass in the ground. But it can get worse. Oh boy it can get waaaay worse.
(I'll say it one more time: sequel to Oh, let's write a fanfic, let's write a fanfic! I'll call it "Thesuperfantasticalstory!". Just in case you missed the link.)
Rated "teen" for language.