Which part and in which way? It's a versatile craft, after all. For instance, I could just be a gracious benefactor and grant you the ability to shift from flesh to crystal, rendering yourself nigh indestructible with a thought. Very useful for keeping safe, really.

[So what if it takes a veritable deal with a devil to get that? CRYSTAL POWERS. YOU CAN BE EMMA FROST MINUS THE CLEAVAGE.]