I just have a feeling that its not reserved for Lumian. More like its open to all for competition. That would explain the person he saw in there. It might be that the sefirot whose seal has been weakened can affect the people around the transmigrators too. Or it can have something to do with his past that Lumian has forgotten, the time before he met his step-sis. Since we don’t know much about Aurora anyways, who knows, her adopting him might have something to do with this specialty.

The City Of Calamity My guys

Klein - God of Fog