[quote=MonsieurShade]
I've looked it up before. However if Nac's characters are comprised of something like tungsten carbide,
[/quote]

Spartan and Eve's skin is made of a mixture of the hardest metals on earth, and a small portion of some from space, with a pinch of experimental technology that allows their skin to flex and feel like human skin =3 Magnus has this skin as well, but it's under heavy reinforced steel plate like scales =3