Expert Collector of Grave Skeletons Expert Collector > Page: 3 Acquiring Req.: Collect at least 50 Grave Skeletons. Reward: When collecting Grave Skeletons, the Collectable Item is doubled. Grave Skeleton Lv 11 Grave Skeleton's Natural Enemy Natural Enemy (11-20) > Page: 1 Acquiring Req.: Kill at least 27 Grave Skeletons. Reward: Killing Grave Skeletons grants you bonus XP. Grave Skeleton Lv 11 Legendary Grave Skeleton Hunter Natural Enemy (11-20) > Page: 1 Acquiring Req.: Kill at least 63 Grave Skeletons. (Grave Skeleton's Natural Enemy Title is required.) Reward: Killing Grave Skeletons grants you bonus XP. Grave Skeleton Lv 11