An element is owned by a warrior. Each element is different from other warriors, so there isn't any confusion. Elements are on warrior's chests, so it reveals what element they are owning and using. It's important to keep it safe and never make anyone mess with it. If a warrior, penguin, or nightmare breaks the element (even a little bit), the warrior dies or gets coma. Then they become a nightmare, becoming Mortem's helpers. Every element has some little special thing inside it to help them.
Elements are more important than orbs, but they're also a little dangerous. Being a warrior is great, but it's a risk to do it.