There were three possible outcomes when one flew through this spatial vortex.
The first was that one would be able to safely reach the other side and enter the Badlands Territory. This was the ideal outcome.
The second was that a spatial rift would suddenly appear in front of you and suck you inside, resulting in you being teleported into an unknown territory of the primordial chaos. Ji Ning knew at least a few things about the Badlands Territory, thanks to the detailed star maps which the Three Realms had acquired long ago. The Mindlord which Ning intended to slay also resided in the Badlands Territory. If he ended up in a completely foreign part of the primordial chaos, he would have to slowly figure everything out from scratch. Still, this wasn't the worst case scenario; he'd still be alive, after all.
The third possible outcome was that the spatial rift would teleport him straight into a death trap of some sort.