Lucien smiled rather awkwardly. "I had the feedback from the truth of the world when I wrote the paper on the general theory of relativity, which generated 'Time Stop', the space-time magic, directly inside my soul."
The spells that involved time and space were an intersection of the schools of astrology, force field, transformation, electromagnetics and light-darkness. They were extremely complicated. The sorcerers who were not adept at the five schools could only construct the models with their mathematical expertise and spiritual power. They were much more difficult to learn than were the spells of the same level.
Lucien's original plan was to build 'Spell Sequencer', 'Raventi's Flame Hell', 'Meteor Swarm' and other spells he was good at when he advanced into the ninth circle, but out of his expectation, 'Time Stop', the ninth-circle magic that was as famous as 'Cracking (Advanced)', was generated on its own.