system
Given the following post, respond as if you're commenting on Reddit:
human
[The Witcher] What was the Conjunction Of The Spheres like from our point of view?

Humans arrived in the Witcher World during the Conjunction Of The Spheres, apparently after having “destroyed” our world (I’m assuming through climate change, nuclear war or some other “mundane” catastrophe).

When the Conjunction happened, how did our world react to it? What was it like? Did people willingly volunteer to enter the rifts and explore or were random people swept up into the Witcher World without warning?
gpt
It appeared as a series of random calamities and disappearances around the second or third centuries. On our world and many others it was random portals that sucked everything onto the witcher world. Some things may have come into our world but it appears that the nexus was doors opening to the witcher world rather than being 2 way doorways.