The world of Atreia is made of four main elements. Certain spirits are made purely of a single element, and they are called elementals.
Elementals are often found in areas where their comprising element is prevalent. For example, Wind Elementals might be found in abundance on the great plains or canyons, while Fire Elementals may roam the desert or around the volcanoes in great numbers.
There are four ranks of Elementals, depending on their power/energy. The most powerful ones are significantly greater in stature than their lesser brethrens.
Certain character classes may be able to summon Elementals to their aid. The rank of Elemental they are capable of summoning depends on their skill level.