Lonelythree
I think the mastery of weapons won't apply to him since, cultivators use their cultivation arts, technique, soul power and their body to fight. As for elemental power he's got his Martial Spirit, As for his body he's got his Dragon body which can be upgraded after increasing his Dragon bloodline concentration, he could also get other races bloodline like Phoenix, Golden crow, Qilin or some Ancient human race or God bloodline. IF the ability only applies until certain realm as the leveling up ability wouldn't be used after reaching certain realm, then Leon could just rewrite or Overrule everything like the Side Effect.