Loot chests will be spawned every 6 hours randomly in the zones 9 to 3. They are global chests and can only be opened once. Means: If you open a chest, other players can't open the same chest anymore.
Loot Chests rewarding the player with a guaranteed Royale Coin, which can be used to unlock the Royale Researches in the castle. A really powerful piece of power! The chest also includes some Royale Items. These are known consumables form the Classic Fortress Kings in a new quality.