[quote=@Prince of Seraphs]
[@Forsythe] So it went from control of shadows to coating her body? Just so I have the details right.
[/quote]

It'S more of  a becoming the shadow issue than getting coated with it. Aside from making her somewhat more durable, when in full control Diamond could behave like a shadow - flatten herself against a wall, extend her limbs like when you shine light on something form the side and the like. Think of it as becoming the tool rather than creating it. Other than that it's exactly the same as before.