"Joan's Puppet Threads"

There were too few people with space abilities, not to mention other non-human races, beasts or monsters. 

Most people with space abilities must have a blessing from generation to generation because their ancestors were close to the space fairies from generation to generation. 

This is something inherited from the family bloodline and not just anyone could actually awaken a space-related ability. 

Still, most space-related abilities owned by non-fairies wouldn't be as powerful as Space Exchange or Space Tear and other things. 

At most, just super short-distance teleportation that could only carry that one person alone. 

There were also people with natural spatial storage ability, but because it was too small, it was more efficient to buy a spatial storage technology. 

Even the current space technology, such as Teleportal, spatial storage and other things, were based on the fairies' technology.