When all the darkness it spread got purified by the sickle, the next thing that happened was the book being shattered in two halves by this sickle, causing a minute explosion inside Arthur's soul.
"Boom!"
This wasn't the sound of an explosion inside Arthur's body, however it was an explosive shock that happened from his body, where the walls holding back his energy suddenly shattered, and his energy soared to reach another level.
"Boom!"
Another explosion occurred as his soul and body absorbed the purified enormous energy from that book. Arthur's energy kept rising in an explosive way, jumping directly to the next level without any restraints this time.
"Good lad," Cesile commended as she knew Arthur had reached a higher level in his talent and strength would subsequently rise as well. "But what was that cursed book?" Otman asked, as this book gave him a very bad feeling.
