[quote=@Bishop]
[@Meta]... do we, right now, have a scientific explanation of spirits? The first part, where he engulfs someone's spirit with darkness to also disable their body is just that, power over the spirit realm.
Now when he comes to the physical plane, he can summon energies from the spirit realm to the physical one, energies which imitate a black hole but only working on energy and not affecting physical matter.
[/quote]

We have several, depending on the dimension you're talking about. 
It all depends on the dimension/universe/multiverse he came from and which one he's in at a given time.