Expert Collector of Ethen Busters Expert Collector > Page: 23 Acquiring Req.: Collect at least 50 Ethen Busters. Reward: When collecting Ethen Busters, the Collectable Item is doubled. Ethen Buster Lv 75 Ethen Buster's Natural Enemy Natural Enemy (71-80) > Page: 3 Acquiring Req.: Kill at least 285 Ethen Busters. Reward: Killing Ethen Busters grants you bonus XP. Ethen Buster Lv 75 Legendary Ethen Buster Hunter Natural Enemy (71-80) > Page: 3 Acquiring Req.: Kill at least 665 Ethen Busters. (Ethen Buster's Natural Enemy Title is required.) Reward: Killing Ethen Busters grants you bonus XP. Ethen Buster Lv 75