The thing with Agate is that…. bravery is the only trait that can be divided in physical and emotional aspects.
Agate’s magic was based around her incredibly high amount of physical bravery, while her emotional bravery was practically non-existent. Making her emotionally unstable.
“Physical bravery is bravery in the face of physical pain, hardship, death or threat of death, while moral bravery is the ability to act rightly in the face of popular opposition, shame, scandal, discouragement, or personal loss.“