She Wants To Kill You

"How's this possible?" Grey asked.

"Simple, creating the needed space in the body." The cloaked lady explained.

"The perfect candidate must be a Space Elementalist who has a unique body type." The cloaked lady added.

"Unique body type?" Grey was a little lost.

"You read so much yet you don't know about these basic things." Klaus felt a bit embarrassed by Grey's lack of knowledge.

Grey was someone who tends to read a lot, everyone close to him is aware of this. But due to the massive amount of knowledge he is acquiring, he occasionally skips a few minor details. In the general scheme of things, these things might not be very important. But like in this case, it is important.