A warrior's scroll chest is an item in Evony TKR (The King's Return). It can be found after killing certain monsters or bosses, with some of them listed below.
The description of Warrior's Scroll Chest in Evony TKR says:
Open to receive a random Scroll for crafting one of Warrior's Equipments.
Warrior's Scroll Chest is known to drop from a number of bosses or monsters upon killing, including Peryton, Minotaur, Royal Thief and Junior Cerberus.
Note: This list may be incomplete.