Found out that the FantasyVerse title for Undertale Au was taken before me.

So I'm changing the name - FantasyVerse is now Arbor Mundi Verse. Actually, that name fits a lot more. All because AMVerse is a multiverse existing at the expense of the world tree. The explanation of the structure of this multiverse is already spelled out in the lore. At the moment I already have two parts with it and I want to finish the third. The English translation will be released after that.