Expert Collector of Bigknife Thieves Expert Collector > Page: 4 Acquiring Req.: Collect at least 50 Bigknife Thieves. Reward: When collecting Bigknife Thieves, the Collectable Item is doubled. Bigknife Thief Lv 29 Bigknife Thief's Natural Enemy Natural Enemy (21-30) > Page: 4 Acquiring Req.: Kill at least 51 Bigknife Thieves. Reward: Killing Bigknife Thieves grants you bonus XP. Bigknife Thief Lv 29 Legendary Bigknife Thief Hunter Natural Enemy (21-30) > Page: 4 Acquiring Req.: Kill at least 119 Bigknife Thieves. (Bigknife Thief's Natural Enemy Title is required.) Reward: Killing Bigknife Thieves grants you bonus XP. Bigknife Thief Lv 29