Leon learned much from Arden's diary. To be able to find the diary of a legendary figure, who was much involved in the history of the Nova Empire on their first trip to the second underground floor, he could only attribute it to his good luck.
There were no doubting Arden's talents as a genius runic artificer. However, if he didn't have the guidance of a good master, his attainments in runic artificing would have taken much longer to achieve.
Leon was much more interested in Arden's runic artificer master than Arden himself. Arden's runic artificer master, Balthazar was the most authoritative figure in the runic artificer circle. It could even be said that the foundation of Nova's runic technology was built upon Balthazar's otherworldly knowledge.
Before Balthazar arrived, the runic artificer profession did not exist in the Nova country. But after his arrival, the Nova country became the most powerful country with its leading runic technology.