Inventory Pets could be promos that help you out. An inventory pet would look like a certain mob's head and be enchanted. Each one would unique and help you in different ways. Each potion effect lasts for 15 seconds.Ocelot - Speed every once in a whileVillager - 1 emerald every hourBlaze - Fire Resistance every once in a whileGuardian - Water Breathing every once in a whileSpider - Night Vision every once in a whileEnderman - 1 ender pearl every 10 minutesSo on. These promos would be more unique, and rather quite helpful in certain situations, and only work if they are in your inventory.