Cosmic Curtaincall
A Denizen of Infinity discovers a newborn universe seeking the only thing Infinity does not have:
An End. Of any kind.
Out from infinity and into the finite plane, Athelei manifested beside the initial point of creation. Now, not one, but two Big Bangs will wreak havoc upon the nigh-endless emptiness.
What else would you expect when a paradoxical, high-dimensional being steps into a world similar to ours? A Holy Light? The birth of a God? Pft.
The natures of matter are unaligned. Nay, they are opposite.
The rules of physics are simply incompatible.
Annihilation was all that awaited what comprehensible physical form Athelei had ownership of.
So, Athelei simply extracted his existence, leaving his infinite body to mesh with the energies of the newborn universe.
He then stepped forward to walk through an ocean of time, seeking a timeline and a specific time at random. Now, Athelei was floating in the midst of a thriving universe...
But then, a seemingly human emotion tugged at him, as human thoughts bubbled into his mind.
"Something's.... wrong..."
In more ways than one.
=} What's wrong with this universe? {=
Aside from the typical planets, galaxies, atoms, and other scientific rules, other magical features had mutated into existence due to the universe's special creation. There are three unique Systems, weird and baffling alien races, magical lifeforms, jaw-dropping technology, and Unknown Mystical Phenomenon.
The universe is also not populated by 99.999999% empty space. There are weird places where things can live that are not planets as well as more accessible transportation systems that beat wormholes. Who knows? Maybe some kind of tower just pops into existence—a magical tower with a height of at least a few lightyears.
In short, instead of a fantasy world, we have a fantasy universe. A perfect place for an MC with an unquenchable curiosity despite his... artistic (read, psycho) desires.