When Darea took off to find Avion, she found something. She had forgotten about this but back then when Avion was still staying at the Romen Mansion, staying in the country of Haliviana, she tried to create a book while time was stopped.
Darea didn't know what to make back them. She was just wanting to try a theory of hers. She tested it with Avion's stoppage of time. After thinking for some time, she finally got the conclusion.
Darea wanted to mark Avion so that if ever he tried to escape and had the ability to do so, she would be able to know his location. But that was not enough. There are already Elesp books like that existing.
She wanted to test the advantage of stopped time. She wanted to have a challenge and create a new unique book. So she planned and pondered if it was possible. Not only would she mark Avion, but she would also be able to directly teleport to where he is.
When she was done, she called it Spaceless Distance Elesp!