New World

This is an answer to some questions and because I wanted to clear up some things.

First, the Enderdragon can't communicate. Endermen are, in this universe, highly protective of their powers and won't let anyone or anypony mess with it. So when Twilight used her magic to pick up the Ender Pearl, the stronger Endermen noticed. And since they are highly protective of their powers and how they work, they decided to learn her a lesson. Since they are creatures of the night, and since they are far stronger then normal ones, they started messing with her mind. Thus, the dream about the Enderdragon. I know, it's a bit farfetched.

Second, about confronting the guardsponies? The Enderman was curious about the pony, as he had never seen anything like it. And because he thinks more lucid and less on instinct, he didn't dodge the arrows.

Why Pinkie killed the zombie? Yeah, can't really explain that. I can only say, because it's a different universe? Yeah, that sounds stupid.

And about the royal guard, this story plays years after season 2, ignoring a lot of parts of season 3. There have barely been any moments in which they actually had to fight. So that should explain it.

Oh yeah, the level of intelligence differs with every Endermen.

If anything else needs to be cleared up, ask me.