Expert Collector of Gritstorm Rex Stars Expert Collector > Page: 41 Acquiring Req.: Collect at least 50 Gritstorm Rex Stars. Reward: When collecting Gritstorm Rex Stars, the Collectable Item is doubled. Gritstorm Rex Star Lv 57 Gritstorm Rex Star's Natural Enemy Natural Enemy (51-60) > Page: 9 Acquiring Req.: Kill at least 183 Gritstorm Rex Stars. Reward: Killing Gritstorm Rex Stars grants you bonus XP. Gritstorm Rex Star Lv 57 Legendary Gritstorm Rex Star Hunter Natural Enemy (51-60) > Page: 9 Acquiring Req.: Kill at least 427 Gritstorm Rex Stars. (Gritstorm Rex Star's Natural Enemy Title is required.) Reward: Killing Gritstorm Rex Stars grants you bonus XP. Gritstorm Rex Star Lv 57