Reikashō

 (歌唱, "Spirit Song" or "Soul Song") is the term used to describe an odd phenomenon that occurs in Humans and other beings possessing supernatural powers.

Overview
A reikashō is a phenomenon which occurs within those with supernatural abilities. It manifests itself as a sound, somewhat akin to singing, hence its name, and occurs whenever a being's soul is greatly effected by outside events or an immense upheaval of emotions; thus they are rare. It is unknown why a being's soul emits this "song", or how, for that matter, the "song" is produced. Nevertheless, it occurs when all conditions are met.

The reikashō of a being is unique to its owner, and has a sound that reflects the state of its owner's soul. For example, if the owner were in great states of despair, the reikashō would emit a sound that is depressing, haunting, or even dark. Whereas an owner who is generally a happy and upbeat person, will have a happy and upbeat reikashō.

The pitch and volume of a reikashō can gauge a being's resolve and even the strength of that being's soul.

When a reikashō begins to play, it is usually foreshadowed by the owner's eyes glowing blue, as well as a blue aura surrounding the owner.