Ido

Within the Bradford kingdom's folklore, Ido is a word in Akina that describes the concept in which spirits that can range from elements of the landscape, forces of nature, as well as beings and the qualities that these beings express; they can also be the spirits of venerated dead people. Ido is adopted from the Japanese concept of Kami and may share similarities.

Experimental
Ido within Casey Universe mainly focuses on magic and the sprite world. However, CU has always bordered on hard sci-fi. So the concept itself is still in the experimental stages, existing in varies one-off alternative universes, and will slowly merge into the main canon gradually so it becomes a Science Fantasy universe.