Originally Posted by
Gemina
Just because it is fiction, does not mean you can't speculate. Writers of fiction actually love it when people reading their material do this!
We know so little about the Voidscent. In the case that a creature from the void possesses a body in this world, it just depends on how much functionality remains intact of the host to the voidscent. If it remains fertile, then a voidscent in possession of a body in this world could have offspring.
The voidscent that don't need a host to sustain themselves in this world is a different matter, as we can only speculate on if they are capable of reproducing. They are such unnatural and vile creatures that we wouldn't think it even possible. The voidscent that are aesthetically pleasing such as the succubus likely follows traditional lore surrounding the creature. SE is known to do this, so the appearance of a succubus is likely a predation to lure in their victims.
That all said, the voidscent can be killed and don't like dying anymore than we do. They are going to operate off of a innate survival instinct, so whatever it is they need to do that, they are going to go after it.