@Nengthegreat though, that's what I think it does based on what the characters said since one of their dialogues on earlier chapters said "You didn't even bother using space isolation? what if the outside world sees and learns of this?" from this line. I'm certain it casts an oblivious spell and a hypnotic suggestion for ordinary people to avoid the area, otherwise, there would have been casualties if there's no hypnotism involved here, as for its effects on awakeners, it probably prevents awakeners from tracking and sensing their presence/powers. So far, none have made an effort to escape from a space isolation so I wonder if it also imprisons the ones inside making it sure that no secret will leave the field, thus, maintaining the secrecy of their world