Big Box's Natural Enemy Natural Enemy (11-20) > Page: 6 Acquiring Req.: Kill at least 27 Big Boxes. Reward: Killing Big Boxes grants you bonus XP. Big Box Lv 15 Legendary Big Box Hunter Natural Enemy (11-20) > Page: 6 Acquiring Req.: Kill at least 63 Big Boxes. (Big Box's Natural Enemy Title is required.) Reward: Killing Big Boxes grants you bonus XP. Big Box Lv 15