Expert Collector of Ghost Thieves Expert Collector > Page: 7 Acquiring Req.: Kill at least 50 Ghost Thieves. Reward: When collecting Ghost Thieves, the Collectable Item is doubled. Ghost Thief Lv 43 Ghost Thief's Natural Enemy Natural Enemy (41-50) > Page: 2 Acquiring Req.: Kill at least 132 Ghost Thieves. Reward: Killing Ghost Thieves grants you bonus XP. Ghost Thief Lv 43 Legendary Ghost Thief Hunter Natural Enemy (41-50) > Page: 2 Acquiring Req.: Kill at least 308 Ghost Thieves. (Ghost Thief's Natural Enemy Title is required.) Reward: Killing Ghost Thieves grants you bonus XP. Ghost Thief Lv 43