Gaia Spirit

Gaia Spirits are mystic beings who teach the Lost Magic: Arc of Gaia

Appearance
Gaia Spirits take on the appearance of Human women; pale white, transparent, and unclothed aside from traditional arm and wrist bands and appearing to have no genitalia. Their eyes are a light shade of purple, they have long white hair, and they have no feet. They appear in many sizes depending on the intensity of training (for example, if the trainee is having to move a large mound of rock or an entire mountain, the Spirit will appear large to compensate).

Biology
Gaia Spirits act with no emotions and speak very softly. They have incredibly beautiful voices and can only be heard and seen by those they're training. They are very merciful and nurturing to those they teach, but are rigourous and brutal trainers at the same time. When they go to train someone, they create a Gaia Sphere, an advanced spell exclusive to them. A full training period lasts three years, but the trainee will rapidly age due to the advanced training, making the experience feel like they have been there for 10 years.