Expert Collector of Hard Cubes Expert Collector > Page: 14 Acquiring Req.: Collect at least 50 Hard Cubes. Reward: When collecting Hard Cubes, the Collectable Item is doubled. Hard Cube Lv 20 Hard Cube's Natural Enemy Natural Enemy (11-20) > Page: 5 Acquiring Req.: Kill at least 27 Hard Cubes. Reward: Killing Hard Cubes grants you bonus XP. Hard Cube Lv 20 Legendary Hard Cube Hunter Natural Enemy (11-20) > Page: 5 Acquiring Req.: Kill at least 63 Hard Cubes. (Hard Cube's Natural Enemy Title is required.) Reward: Killing Hard Cubes grants you bonus XP. Hard Cube Lv 20