Minecraft wiki entry for Your_first_10_minutes, associated text: Be prepared for hostile mobs, as it is a common but fatal mistake for starters to think that the moon spawns hostile mobs, and not simply darkness. If you come back with enough iron, you will be able to experience many more features of Minecraft, mainly redstone, pistons, diamond, and much more. You have started on your path to your success in Minecraft, whether you have found iron or not.