respirdal:

A very quick and messy visual explanation on Plague Witches. 

Fletchlings are tiny children. Think of them as little spirits. Extremely childlike and easy to take advantage of for their components. They tend to hide most of the time.

VARO evolve from a fletchling, imagine a spirit possession over a willing corpse. They lose most of their abilities but get to pass off as humans in the above world. 

Wraith: DO NOT INTERACT