Since the existence of the Underground Cave was very important for all of the Mage families in the Dagon region, foreign elite apprentices such as Leon became their favorite target for recruitment.
First, having some foreign recruits wouldn't cause too much of an impact on their current interests. Without the support of an Mage family, the Apprentice Mages wouldn't have the guts to offend the official Mages openly. So, the recruited elite apprentices could become their most capable hatchet men, but were unable to become one of their competitors.
Second, the Underground World wasn't a peaceful place. The rare resources sought after by Mages from the surface were also the target for the black bastards of the underground. Therefore, the start of every single underground expedition trip and harvesting trip was also the beginning of a chaotic battle between the two parties.
