[@tipssyCalibrator]
I'm thinking of making a mentor whose power is an architect of the earth element. This also means rocks and muds. Metal is not included, though she's currently making an effort to branch out her power to be able to use it as well. I imagine other than the usual earthbending like in Avatar, she can also manifest earth out of her own power, though of course it takes more on her energy. I imagine she can also construct a layer of rock protecting her body in combat. I don't think she would be able to turn her actual skin into rock though as that seems like it's more of an augmenter thing.

She awakened her power back when she was an 11-years old. In a camping trip with her classmates, her group head out to a nearby cave without the supervising teachers knowing. She had already told her friends that she thought it would be a bad idea, but them, being the children they were, didn't listen to her warning. She ended up following them nonetheless as she would feel bad if she snitched to the teachers. In there, they ended up getting lost in the darkness after their flashlights ran out of battery. As her friends cried, she stayed calm and collected, thinking with all her might how she could find a way out. There, she manifested her first power, as she could somehow sense the layout of the cave the more she focused. Indeed, her mind was just like that of the earth, calm and collected in any situation.

Does this sound good?