James knew that Benedict would not obey him entirely without giving him some benefits. Besides, he was worried that Benedict would conspire to set him up. That way, not only would they fail to annihilate the Sanctuary, but even the Pavilion could be implicated.
Benedict was moved. He knew just how powerful Curse Magic was. All these years, he had only obtained a handful of Curse Inscriptions despite his many years of service for the Sanctuary. If James was willing to teach him Curse Magic, this