Shadowheart has a similar discrepancy between narrative and mechanics as it is explained at
that the Sharrans went through training in disguise and subterfuge, and Shadowheart has...8 charisma and no proficiency in deception or persuasion. Though,I suppose maybe the fact that she openly walks around with a sharran circlet goes to prove that she is actually terrible at disguise and subterfuge. Maybe she was just a poor student in that particular class.
