Barto's Natural Enemy Natural Enemy (31-40) > Page: 7 Acquiring Req.: Kill at least 90 Bartos. Reward: Killing Bartos grants you bonus XP. Barto Lv 37 Legendary Barto Hunter Natural Enemy (31-40) > Page: 7 Acquiring Req.: Kill at least 210 Bartos. (Barto's Natural Enemy Title is required.) Reward: Killing Bartos grants you bonus XP. Barto Lv 37