Expert Collector of Crazy Bone Blacks Expert Collector > Page: 27 Acquiring Req.: Collect at least 50 Crazy Bone Blacks. Reward: When collecting Crazy Bone Blacks, the Collectable Item is doubled. Crazy Bone Black Lv 27 Crazy Bone Black's Natural Enemy Natural Enemy (21-30) > Page: 15 Acquiring Req.: Kill at least 51 Crazy Bone Blacks. Reward: Killing Crazy Bone Blacks grants you bonus XP. Crazy Bone Black Lv 27 Legendary Crazy Bone Black Hunter Natural Enemy (21-30) > Page: 15 Acquiring Req.: Kill at least 119 Crazy Bone Blacks. (Crazy Bone Black's Natural Enemy Title is required.) Reward: Killing Crazy Bone Blacks grants you bonus XP. Crazy Bone Black Lv 27