Elements play an extremely important role in the society of the Arcanus. Almost every single individual has the ability to master one or more elements. Some use the elements to fire long-ranged shots, or hand to hand combat, and some put the power of their element into a weapon.
The basic elements are Electric, Wind, Fire, Water, and Earth. There are a lot more variants to these elements, like for example poison, blue fire, plants, ice, sand, metal, lava, etc.
The core is important to many aspects of an Arcanus's life, and is directly affected by health, sickness, and corruption. Its size depends on rank: the higher the rank, the larger the core. At Legendary and beyond it can grow so large it spills out and shapes physical traits and the battle armor. A higher rank means a bigger core, longer lifespan, and a more powerful elemental output.
The bigger the core, the longer elements can be channelled and the larger the attacks. The core will automatically halt elemental use at 5% remaining to protect its host. Forcing through that final 5% is a direct threat to the bearer's health, and to life itself.
A bigger core does not automatically mean a more skilled user. Learning to use an element takes time, dedication, and sometimes talent — a skilled elemental user does not have to be of a high rank.
Elemental powers can be used in various ways. Which way works depends on how big the core energy is and on the skill level of the individual. Certain ways of elemental usage take more energy than others, and are best suited to higher-ranked individuals with larger energy cores.
How an element is used also affects the necessary core energy and training. Take the water element as an example. You can take water from the rain or a lake and manipulate it to shoot at — or suffocate — an enemy. The larger the area you manipulate, the more energy it costs. Doing this by summoning the element instead of drawing it from the surroundings is also possible, but takes more.
Manipulating the essence of an element — such as changing the water's temperature — takes more energy still, because it borders on another element entirely (ice, or fire). This needs more advanced training and a heavier draw on the core.