I found the land of the dragons to be better for master. Go to the palace and go to the save point. This is your friend. After you go to the ante chamber and get 80 xp from the 6 knight rider dudes, go back to the world map. If you have all 7 drive gauges, activate any summon first and let it rune out for summon xp, then you still have 4 drive gauges to do master.