>>539686903
>>539687032
>>539687091
Nebulae in Limbus is more of an Ideal that you can reach to, they aren't gonna come down with fucking alien spaceships and shit.
Demian implies multiple times he simply projects himself to this ''world'' since the light actually can't reach him because he's so far away. It's some kind of metaphysical bullshit in PMs case, and is also being properly build up.
It is something you can achieve as a human.