The Multiversal Planet is directly contained within the Multiverse (not part of a Universe) and is the largest planet in existence (at least we think). There is not much known about these planets, since they are so big nobody could ever discover its true diameter or what lives on it. Other than that, the only thing we know is that it IS habitable and has life on it. It has low gravity, so it defies gravity, because normally a big planet's gravity would crush you.
There is only 1 per Multiverse, and 100 per Ytayafëllxverse