@Kulta kai
Nah, there’s no Earth Princess just the ones on the Sun, Moon, Love, Friendship and Humility. And da baby.

Hold on. Is there a third princess. One who controls the orbit of the planet?(I’m asking cause the csrving in the corner bears the cutie marks of Luna and Celestia

@Jacalope  

They were actually designed after the observers that appeared in the old TV series Fringe.

@Phoenixflambe  
Observer is a background pony which appear in every Andy Price MLP comic like an easter egg. Looks like a men in black pony.
 
 
@Background Pony #0887  
Dude, stop repeating many times about Tambelon/Grogar thing in season 10. You will be really dissapointed if that isn’t the case, it’s like i am repeating million of times that Discord and Cunabula are strongly related just because in a interview, a show writer said IDW are the group who will tell about Discord’s origin (If isn’t Cosmos arc that story, something i doubt because… that don’t explains nothing about him, just retcons something that everbody knows in S2) but i don’t think everytime about it because nobody knows what will happen until someone read it, just look at #97, Baast’s species mention was something i didn’t expected.
 
So, be patient and don’t assume, you can theorize but not assume that it will be because how i said, you will be disappointed if that’s not the thing.

Who the heck is Observer?

The point here being, Equestria’s Tree of Harmony wasn’t in a temple. It’s in the Everfree Forest, in a cave. So either they didn’t find it back then for some reason, or they did find it, but dismissed friendship as an important concept. Which would fit in with many flawed characters.

Of course they did.

With that 8 simbol, it’s definitive Equestria is a DC earth.