Otherwise known as a "Derpyverse", Sevenverse is a better term in my opinion, as it's centered on the Mane Six, the main two being Derpy and Twilight, equally the main ones.

So, Derpyverse would be an unfair title.

Enough said.

SEVENVERSE
What is the Sevenverse?
It's a universe where there are seven main characters, the mane six plus Derpy Hooves.

And there are seven elements, all of the regular six, plus the surprise one, the Element of Derpy Harmony.