Sort of, [Hange starts before elaborating further.] So far there's no known man made object capable of penetrating the crystalized armor produced by these specific titans, but it doesn't appear that they're capable of adjusting the strength or potency of said shields.

[The fact that Greed's capable of controlling that factor is amazing in and of itself, and maybe learning more about the nature of his skills will provide her with another angle on how to properly analyze the titans.]

I've glanced over his file but I only know as much about homonculi as it provides. [She continues on since Ed technically asked her what she knew anyway.] Greed told me himself that this Ultimate Shield is a specialized ability that only he possesses, but what are the sort of traits that all homunculi share?