Hangesu

Hangesu is the over-arching term for nine species of migratory amorphous beings. While there is variance between the species, they are invariably private and rarely disclose their motivations or actions to anyone outside of their own societies. Of the nine species of hangesu, four are extinct and two are critically endangered.

Hangesu Species
The hangesu species have their own names for themselves, but the common terms are:
 * 1) High Hangesu
 * 2) Lower Hangesu (critically endangered)
 * 3) Secondary Hangesu
 * 4) Tiffwo Hangesu (extinct)
 * 5) Epnin Hangesu (extinct)
 * 6) Great Hangesu (extinct)
 * 7) Hin-Wahn (critically endangered)
 * 8) Simun Han
 * 9) Si Hin (extinct)

Appearance
Most of the hangesu species are amorphous in their natural appearance. They range from semi-solid, cohesive, opaque beings (High Hangesu, Simun Han) to primarily transparent, gaseous entities (Lower Hangesu, Epnin Hangesu).

Of the species, seven have the ability to change shape at will. While most cannot do so to a great extent, several (High Hangesu, Lower Hangesu, Simun Han, and Great Hangesu) are able to mimic other species accurately and effectively. This ability is a fundamental part of those species' cultures. When they mimic another species, they do more than simply change their appearance. In effect, they change their entire biology, copying anatomy as well.

Healing and Recurrence
The most notable shared feature between all hangesu species is their ability to heal. Due to their incongruous nature, hangesu also have the ability to repair damage and illness to themselves to an extreme degree.

Part of this healing ability is called hangesu recurrence. If a hangesu is gravely injured, to the point where death is imminent, they have the ability to cocoon themselves in layers of cells and enter a state of hibernation while their body repairs itself. The term comes from the fact that, once the healing has finished, they are essentially reborn, as their body heals even minor injuries and fully refreshes the body during the processes.