Selena's efficiency was indeed high.
After leaving the Underground Laboratory, she went to the Teaching District of the Deep Sea Branch and brought back three Illusion Bodies.
The name "Illusion Body" might lead one to believe it's purely created by Illusion Magic.
But in fact, that's not the case.
Essentially, it is a magic puppet that specific casters can manipulate.
These magic puppets are crafted by magic craftsmen and usually resemble dolls or mannequins in appearance.
After being enchanted with the effect of Illusion Magic, the appearance of the magic puppet then transforms into a translucent humanoid species in the eyes of people.
If a detection spell is cast on the Illusion Body, or if Magic Vision is activated, it's still possible to see through the illusion and see its true form.
The three Illusion Bodies that Selena had brought back were of the appearances of a 20-year-old girl in her youth, a 25-year-old young woman, and a 30-year-old mature woman.