The mortal life cycle. The Le'enle are immortals, and in order to keep themselves sane and their perspectives fresh, they choose to become enfleshed and born as mortals, there to live out a normal life. When they die, they are released back to their Le'enle selves, remembering who they are.
The Jinao-ela was discovered by Streaming World, a Le'enle who lost her lifemate to it. Commonly depicted as a golden woman with white hair, she died a Teacher.