Earth-210 is the universe owned by ShadowFire, its where his series take place.
Dimensions
Dimension 13
This is the dimension where Alex Lowell and Avice Fry come from. Due to currenly unknown reasons 5% of the newborn humans tend to have genetic mutations and/or special abilities. It needs to be noted that this Earth is dying due to overuse and destruction of its resources.
Dimension 25
The dimension where Duplex Tribulatio (tittle unconfirmed) takes place. The time and space of this universe are in complete chaos that cause various kind of phenomenons to happen like the appearance of space and time warps or the fusion of numerous planets into a single existence.
Tray's Space
A hidden pocket dimension that containts the "element of creation" that's used to create universes, dimensions and timelines. Its a place where the rules of time & space hold little to no meaning.