Metaverse
It's basically just a setting of a whole story.
Metaverse is basically the creation itself.
2nd Creation actually.
Metaverse consists of outerverses
Outerverses consist of multiverses
and multiverses consist of universes.
This world is as infinite as you can imagine. If you can think of any scenario that ever happened, type of world that could possibly exist, it is there and there is no shortage of them.
Time rolls differently in different worlds.
Worlds and dimensions are basically the same just located on differend narrative layers.